Most i.MX boards booting off eMMC or SD cards use raw U-Boot located at
69 kB offset from beginning of the device - create a recipe for such
image.
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
The same combined image format can be used to boot both i.MX 6 and
i.MX 7 platforms - extract the common part.
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>