the SAT spec from t10.org defines messages for tunnelling ATA commands over

SCSI when you're talking to a scsi to ata translation layer (satl). this
implements the ata command ioctl handler in scsi_ioctl.c that wraps the
ata command requests up in these scsi commands and then issues them against
the hardware. this cuts atascsi over to interpreting these scsi commands
rather than the ioctls directly.

this should allow mpi users (with a relatively recent firmware) to use
atactl against their SATA disks. i cant test cos my mpi(4) parts are too
old to either support these scsi commands or too old to take recent
firmwares.

ok marco@ @krw tested by krw@ and me on ahci/atascsi

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