[SCSI] Add SATA support to libsas

Hook the scsi_host_template functions in libsas to delegate
functionality to libata when appropriate.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>

Misc code changes and merge fixes and update for libata->drivers/ata
move

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>