support for NS DP83847

["Jan Pedersen" <jan.pedersen@glaze.dk>]

A patch which adds support for the National semiconducor DP83847 PHY in the
au1000 driver is available at http://www.jp-embedded.com. It is well tested,
feel free to use it. There is also a patch available which adds supports for
the mips based boards available at the same site. If there are iterest of
adding theese to the linux-mips kernel cvs, feel free to do so.