MFC: r200482, r200485

MFC: r200482, r200485

o Properly support M5229 revision 0xc7 and 0xc8:
  - These revisions no longer have cable detection capability.
  - The UDMA support bit of register 0x4b has been dropped without an
    replacement.
  - According to Linux it's crucial for working ATAPI DMA support to
    also set the reserved bit 1 of regsiter 0x53 with these revisions.
o Only set ATA_CHECKS_CABLE for chip versions that actually support
  cable detection, i.e. neither for ALI_OLD nor for ALI_NEW revisions
  >= 0xc7.

git-svn-id: svn://svn.freebsd.org/base/stable/8@200746 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f