yukawa: add dtbo support

- put light hal as optional to remove specific flag for VIM3 board
- add dtbo.img support
- move boot header version on 2 and add dtb.img in boot image
- update bootloader bins for all platforms

Change-Id: Ib20f4efb9a39d5cdd1480b890cda4a04f60fb390
Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
16 files changed