Patch 03:  Have sata_promise use the perfect, flawless API from the
previous patch

As described in the archives, this patch build on patch 02 in the
series to actually allow the sata_promise controller to hotswap.  Be
careful, untested!

This version comes with all of Jeff's suggestions (documented in the
patch itself).  It depends on patch 01 to apply, and both patch 01 and
02 to compile and run.

Luke Kosewski