libata sata_qstor nuke idle state

sata_qstor nuke idle state.

We're really only ever in one of two hardware states:  packet, or mmio.
Get rid of unnecessary "qs_state_idle" state.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>