meta-digi-arm: u-boot-dey: Modify boot script for mainline kernel use

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>

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

@@ -0,0 +1,16 @@
+#
+# U-Boot bootscript for NAND images created by Yocto.
+#
+if test "${board}" = "ccimx6ulsbc"; then
+	setenv fdt_file zImage-imx6ul-ccimx6ulsbcpro.dtb
+else
+	setenv fdt_file zImage-imx6ul-ccimx6ulsbcexpress.dtb
+fi
+
+if test "${mtdbootpart}" = "recovery"; then
+	setenv boot_initrd true
+	setenv initrd_file uramdisk-recovery.img
+else
+	true
+fi
+dboot linux nand ${mtdbootpart}