The AR150 seems to have the same MAC address on eth0, eth1 and
phy0. Although it is not a ONEPORT, we can use the shifted bit
like for the ONEPORT devices to get a distinct ETHMESHMAC.

Signed-off-by: Adrian Schmutzler <[email protected]>
Reviewed-by: Tim Niemeyer <[email protected]>
Reviewed-by: Jan Kraus <[email protected]>