MFC: rev. 1.53, 1.60, 1.61
MFC: rev. 1.53, 1.60, 1.61

- hw.ata.wc can cause data loss on crashes too.  This brings the
  description of the hw.ata.wc in sync with tuning(7)
- Via VT8251 support.
- Support for Marvell chipsets.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase