explicitly read phy settings for ar934x ports

The lan0 port is connected through a built-in switch so ethtool ioctls can't
read its phy settings. The simplest solution is to explicitly answer
SIOCETHTOOL requests if they're for ar934x switch ports.

b/22634981

Change-Id: Iad4b8a760423593b835039ae4bef71b6aa1ebafa
1 file changed