Fix up the sis driver, largely to improve the NatSemi DP83815 support:

- Modify the driver to poll the link state and positively set the
  MAC to full or half duplex as needed. Previously, it was possible
  for the MAC to remain in half duplex even though the PHY had negotiated
  full duplex with its link partner, which would result in bursty
  performance.

- Program some of the NatSemi's registers as specified by the datasheet.
  The manual says these are necessary for "optimum perofrmance," though
  a couple of them are marked as reserved in the register map. *shrug*

- Select the TX DMA burst size correctly for 10 and 100mbps modes.
  Previously I was using 64 bytes in both modes, which worked in
  100mbps mode, but resulting in spotty performance in 10mbps.
  32 bytes works much better; without this change, the natsemi
  chip yields piss poor performance at 10mbps.

With these fixes, the NatSemi chip finally performs to my satisfaction.
I should be merging the support for this controller into -stable shortly.

Phew.

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