beaglebone.conf: add IMAGE_BOOT_FILES
Set IMAGE_BOOT_FILES to list of files that end up in boot
partition. This in turn is used by wic to generate a bootable SD card
image.
(From meta-yocto rev: 4ee4785154c1702ecfb8389f3c6ab99957a2f1d0)
Signed-off-by: Maciej Borzecki <maciej.borzecki@open-rnd.pl>
Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>