The sysupgrade image contains OpenWrt specific metadata. Having this
metadata in the factory images makes no sense. Drop IMAGE/factory.bin
from Device/ubnt-wa and use the default from Device/ubnt instead.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Petr Štetiar <ynezz@true.cz>
Acked-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>