hikey: flash-all.sh: Add command to set unique serial number on flash

To set the unique serial number, we need to call fastboot oem serialno
from the l-loader.bin's fastboot mode (not the UEFI fastboot).

So generate a serialno when we are doing a flash-all.sh

Change-Id: Id5b3cb5530ad3b265c65d0b6b0900e8625a25de7
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed