Reoganize/update the SysKonnect driver:

- Break out the support for the XMAC II's PHY into an miibus driver.

- Reorganize the probe/attach stuff using newbus. Each XMAC is now
  attached to the parent GEnesis controller using newbus. This is
  necessary since each XMAC must also have an attached miibus, and
  the miibus read/write register routines need to be able to get
  at the softc struct for each XMAC, not the one for the parent
  controller. This allows me to get rid of the grotty code I added
  for selecting the unit numbers for the ifnet interfaces: the unit
  numbers are now derived from the newbus-assigned unit numbers,
  which should track with the ifnet interface numbers. I think.
  At the very least, there should never be any collisions.

- Add support for the SK-9821 and SK-9822 1000baseTX adapters. Special
  thanks to SysKonnect for loaning me two adapters for testing.

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