dualboot: move the logic of fallback boot to altbootcmd

U-Boot has embedded support to handle bootcount tries.
When the limit of tries is reached, U-Boot runs the script
in `altbootcmd` rather than the usual `bootcmd`.
This other script resides on meta-digi-dualboot layer.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Signed-off-by: Francisco Gil <francisco.gilmartinez@digi.com>

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx6qpsbc/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx6sbc/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx6ulsbc/boot.txt

@@ -11,23 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${mtdbootpart}" = "linux_a"; then
-				setenv mtdbootpart linux_b
-				setenv mtdlinuxindex ${mtdlinux_b_index}
-				setenv mtdrootfsindex ${mtdrootfs_b_index}
-				setenv rootfsvol ${rootfsvol_b}
-			else
-				setenv mtdbootpart linux_a
-				setenv mtdlinuxindex ${mtdlinux_a_index}
-				setenv mtdrootfsindex ${mtdrootfs_a_index}
-				setenv rootfsvol ${rootfsvol_a}
-			fi
-			setenv active_system ${mtdbootpart}
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx6ulstarter/boot.txt

@@ -11,23 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${mtdbootpart}" = "linux_a"; then
-				setenv mtdbootpart linux_b
-				setenv mtdlinuxindex ${mtdlinux_b_index}
-				setenv mtdrootfsindex ${mtdrootfs_b_index}
-				setenv rootfsvol ${rootfsvol_b}
-			else
-				setenv mtdbootpart linux_a
-				setenv mtdlinuxindex ${mtdlinux_a_index}
-				setenv mtdrootfsindex ${mtdrootfs_a_index}
-				setenv rootfsvol ${rootfsvol_a}
-			fi
-			setenv active_system ${mtdbootpart}
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx8mm-dvk/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx8mn-dvk/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx8x-sbc-express/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccimx8x-sbc-pro/boot.txt

@@ -11,30 +11,6 @@
 if test "${dualboot}" = "yes"; then
 	if test "${upgrade_available}" = "1"; then
 		echo "Update detected; Booting new system (try ${bootcount})"
-		if test "${bootcount}" = "${bootlimit}"; then
-			echo "## Update failed; Rolling back to previous version."
-			if test "${active_system}" = "linux_a"; then
-				part number mmc ${mmcbootdev} linux_b pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_b_index
-				part number mmc ${mmcbootdev} rootfs_b rootfs_b_index
-				# Save the rootfs_b UUID into mmcroot_b
-				part uuid mmc ${mmcbootdev}:${rootfs_b_index} mmcroot_b
-				setenv mmcroot PARTUUID=${mmcroot_b}
-				setenv active_system linux_b
-			else
-				part number mmc ${mmcbootdev} linux_a pi
-				setenv mmcpart ${pi}
-				# Save the partition index on variable rootfs_a_index
-				part number mmc ${mmcbootdev} rootfs_a rootfs_a_index
-				# Save the rootfs_a UUID into mmcroot_a
-				part uuid mmc ${mmcbootdev}:${rootfs_a_index} mmcroot_a
-				setenv mmcroot PARTUUID=${mmcroot_a}
-				setenv active_system linux_a
-			fi
-			setenv upgrade_available
-			saveenv
-		fi
 	else
 		if test "${active_system}" = "linux_a"; then
 			echo "Booting from system A"