There's no valid mac address for the second band in the eeprom. The vendor fw uses 2.4G mac + 4 as the mac for 5G radio. Do the same in our firmware. Fixes:23be410b3d("ramips: add support for TOTOLINK X5000R") Signed-off-by: Chuanhong Guo <gch981213@gmail.com> (cherry picked from commit2126325400)