- Rename the Cronyx Omega2-PCI entry to Exar XR17C158 since that is the   real owner of the device ID.  Also rename the associated config   function while here. - Add support for the 2-port and 4-port Exar parts as well: Exar XR17C/D152   and Exar XR17C154.
- Rename the Cronyx Omega2-PCI entry to Exar XR17C158 since that is the
  real owner of the device ID.  Also rename the associated config
  function while here.
- Add support for the 2-port and 4-port Exar parts as well: Exar XR17C/D152
  and Exar XR17C154.

Tested by:	Mike Tancsa, Willy Offermans  Willy of offermans rompen nl
MFC after:	1 week

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