edgerouter: add edgerouter.wks

Currently edgerouter machine uses sdimage-bootpart.wks from
scripts/lib/wic/canned-wks. It'd be easier to find this file
if it's name contains machine name and it's located in the same
layer.

Added edgerouter.wks to meta-yocto-bsp/wic/ to make it independent
from changes in oe-core and easier to maintain.

[YOCTO #8719]

(From meta-yocto rev: 6313c8fffe0dd4c3670ed06eca4c0a815d931e4a)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/conf/machine/edgerouter.conf

@@ -21,6 +21,6 @@ MACHINE_EXTRA_RRECOMMENDS = " kernel-modules"
 IMAGE_FSTYPES ?= "jffs2 tar.bz2 wic wic.bmap"
 JFFS2_ERASEBLOCK = "0x10000"
 
-WKS_FILE ?= "sdimage-bootpart.wks"
+WKS_FILE ?= "edgerouter.wks"
 IMAGE_BOOT_FILES ?= "vmlinux;vmlinux.64"
 do_image_wic[depends] += "mtools-native:do_populate_sysroot dosfstools-native:do_populate_sysroot"

meta-yocto-bsp/wic/edgerouter.wks

@@ -0,0 +1,4 @@
+# short-description: Create SD card image for Edgerouter
+# long-description: Create a partitioned SD card image for MIPS64 Edgerouter reference hardware.
+part /boot --source bootimg-partition --ondisk sda --fstype=vfat --label boot --active --align 4 --size 16
+part / --source rootfs --ondisk sda --fstype=ext4 --label root --align 4