[SCSI] advansys: Remove DvcGetPhyAddr

This rather complex function boiled down to calling virt_to_bus().
Also get rid of some obsolete defines and variables that could never vary.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>