PS3: gelic: change the prefix of the net interface for wireless

The gelic driver uses two net interfaces, one for ethernet and the
other for wireless. They share same MAC address and use 'eth' prefix
for the name.
As udev uses the MAC address to check uniqueness, this is
somewhat problematic.  So change the prefix of the network interface
name for the wireless so that udev can have an easy way to distinguish
interfaces.

Signed-off-by: Masakazu Mokuno <mokuno@sm.sony.co.jp>
Signed-off-by: John W. Linville <linville@tuxdriver.com>