Stop phy code from returning success to unknown ioctls.

Stop phy code from returning success to unknown ioctls.

This kind of sucks, and prevents the Fedora installer from using the
device for network installs...

[root@efika phy]# iwconfig eth0
Warning: Driver for device eth0 has been compiled with an ancient version
of Wireless Extension, while this program support version 11 and later.
Some things may be broken...

eth0        ESSID:off/any  Nickname:""
          NWID:0  Channel:0  Access Point: 00:00:BF:81:14:E0
          Bit Rate:-1.08206e+06 kb/s   Sensitivity=0/0
          RTS thr:off   Fragment thr:off
          Encryption key:<too big>
          Power Management:off

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>