1) AHCI regression fix. A recent "make driver conform to spec" change

   broke on deployed hardware.  Make new behavior optional, rather than
   default, turning it on only for specific embedded platforms that need this.

   Everybody else runs in the famous "non conformant but working" mode.

2) pata_cmd64x, pata_legacy cleanups

3) new Intel SATA PCI IDs

4) misc minor vendor feature additions
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