sdcard_image-rpi.bbclass: Include boot script when using u-boot
sdcard_image-rpi.bbclass: Include boot script when using u-boot

Signed-off-by: Paul Barker <a027184a55211cd23e3f3094f1fdc728df5e0500@paulbarker.me.uk>

toolmmy/meta-raspberrypi,leon-anavi/meta-raspberrypi,d21d3q/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,toolmmy/meta-raspberrypi,schnitzeltony/meta-raspberrypi,schnitzeltony/meta-raspberrypi,toolmmy/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,kraj/meta-raspberrypi,schnitzeltony/meta-raspberrypi,d21d3q/meta-raspberrypi,leon-anavi/meta-raspberrypi,d21d3q/meta-raspberrypi,kraj/meta-raspberrypi,d21d3q/meta-raspberrypi,kraj/meta-raspberrypi,agherzan/meta-raspberrypi,toolmmy/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,agherzan/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,agherzan/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi,LocutusOfBorg/meta-raspberrypi