linux: use proper version numbers for platforms still using v4.9

Even though our ccimx6 and ccimx6qp images were using Linux v4.9 sources
correctly, they were using the same recipe as our images with Linux v4.14.
Technically, both recipes are identical (save for the branch name), but each
Linux version should have its own recipe.

Also, make sure that ccimx6/ccimx6qp images are built with our version of the
linux-imx-headers recipe instead of the one in meta-freescale.

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>

meta-digi-arm/conf/machine/include/ccimx6.inc

@@ -18,6 +18,9 @@ KERNEL_DEFCONFIG ?= "arch/arm/configs/ccimx6sbc_defconfig"
 # Wireless external module
 WIRELESS_MODULE ?= ""
 
+# Use our recipe of linux-imx-headers instead of the meta-freescale one
+PREFERRED_VERSION_linux-imx-headers ?= "4.9"
+
 # Firmware
 MACHINE_FIRMWARE ?= "firmware-imx-sdma"
 MACHINE_FIRMWARE_append_mx6q = " firmware-imx-vpu-imx6q"

meta-digi-arm/recipes-kernel/linux/linux-dey_4.14.bb

@@ -2,4 +2,4 @@
 
 require recipes-kernel/linux/linux-dey.inc
 
-COMPATIBLE_MACHINE = "(ccimx6|ccimx6ul|ccimx8x)"
+COMPATIBLE_MACHINE = "(ccimx6ul|ccimx8x)"

meta-digi-arm/recipes-kernel/linux/linux-dey_4.9.bb

@@ -0,0 +1,5 @@
+# Copyright (C) 2019 Digi International
+
+require recipes-kernel/linux/linux-dey.inc
+
+COMPATIBLE_MACHINE = "(ccimx6)"

meta-digi-arm/recipes-kernel/linux/linux-imx-headers_4.14.bb

@@ -0,0 +1,5 @@
+# Copyright (C) 2019 Digi International
+
+require recipes-kernel/linux/linux-imx-headers.inc
+
+COMPATIBLE_MACHINE = "(ccimx6ul|ccimx8x)"

meta-digi-arm/recipes-kernel/linux/linux-imx-headers_4.9.bb

@@ -0,0 +1,5 @@
+# Copyright (C) 2019 Digi International
+
+require recipes-kernel/linux/linux-imx-headers.inc
+
+COMPATIBLE_MACHINE = "(ccimx6)"