Remove some debugging code.

Submitted by:	Steve McConnell <stephen.mcconnell@avagotech.com>
MFC after:	3 days
Hold the SIM lock when calling xpt_create_path() and xpt_action() in
mprsas_SSU_to_SATA_devices().

This fixes an assertion on shutdown with INVARIANTS enabled with SATA
drives present on an IR firmware controller.

Reviewed by:	Steve McConnell <stephen.mcconnell@avagotech.com>.
MFC after:	3 days