Patch 01:  add promise SATAII150 support to the sata_promise driver.

As described in the archives, this patch adds support for those
notorious SATAII150 controllers with their weird hotplug offset and
prepares us for hotplug goodness.

Jeff:  The reason that ATA_FLAG_SATA is commented out on pdc_2057x
controllers is to keep them consistent with the 2037x controllers in
libata + sata_promise support PATA ports (as seen in 2.6.13-rc3-mm1). 
I've implemented all your other suggestions.

Luke Kosewski