The pcnet32 driver was not correctly enabling MII autonegotiation after
booting when ppc firmware forced the speed/duplex mode of the chip.
After several conversations with AMD this patch corrects the problem.

I have tested this on hardware I have available (ia32 and ppc64) but I
would like wider audience testing of this patch.
Signed-off-by: Don Fry <brazilnut@us.ibm.com>