netxen: remove private ioctl

The netxen driver includes a private ioctl that provides access
to functionality that is already available in other ways. The PCI
layer has application access hooks (see setpci), and the statistics
are available in ethtool/netstats.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>