This patch changes wan MAC address setup from retrieving it by
calculation to reading it from flash.
Changes are limited to cases where on-device check was possible.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
[fix mac for newifi-d1; drop adslr,g7 because it's unlikely for
vendor to specifically use 2.4g mac as wan_mac]
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>