Initial draft of a helper which uses generic elements present in several
net drivers to implement ethtool ioctl support in a minimum amount of
code.

I have included a sample implementation in the epic100 driver, to
illustrate how these helpers may be used.  This should make it easier to
implement support across 10/100 hardware which uses primarily an MII
phy.

Comments appreciated.

-- 
Jeff Garzik      | Andre the Giant has a posse.
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