A while ago Mika Liljeberg dug through the RTL8029.doc and
sent me the sequence to enable full duplex for these after
testing it worked OK.  The current sequence is just a copy
of the Holtek sequence and apparently doesn't work.

While updateing the sequence, I separated out the FDX code from
ne2k_pci_open() for enhanced readability and so that it may
also be called from other code paths eventually (e.g. ethtool)

Patch is against 2.6.0-test5.

Thanks,
Paul.