Bug#845779: flash-kernel: flashkernel uses mkimage -A arm on arm64

[Martin Michlmayr]

Thanks, I applied this patch.

U-boot on the ARM64 system I tested (a Jetson TX1) accepts boot
scripts with both -A arm and -A arm64, but as you point out this may
not be the case on all systems.

-- 
Martin Michlmayr
http://www.cyrius.com/