The label MAC address for DIR-825 Rev. B1 is the WAN address located
at 0xffb4 in `caldata`, which equals LAN MAC at 0xffa0 incremented by 1.
Signed-off-by: Sebastian Schaper <openwrt@sebastianschaper.net>
(cherry picked from commit 4bed263af7a13cb4b9401f7ae04f788cfcc234f7)
b42511c007