lantiq: fix VGV7519 and VGV7510KW22 mac addresses

The VGV7510KW22 stock firmware uses the following mac-addresses:

lan      (ifno 1): AA:BB:CC:DD:EE:60
wlan     (ifno 2): AA:BB:CC:DD:EE:61
atm0     (ifno 3): AA:BB:CC:DD:EE:62
atm1/wan (ifno 4): AA:BB:CC:DD:EE:63

The VGV7519 stock firmware uses the following mac-addresses:

lan:  AA:BB:CC:DD:EE:EF
wlan: AA:BB:CC:DD:EE:EF
wan:  AA:BB:CC:DD:EE:EE

Signed-off-by: Mathias Kresin <dev@kresin.me>