block: Consolidate phys_segment and hw_segment limits

Except for SCSI no device drivers distinguish between physical and
hardware segment limits.  Consolidate the two into a single segment
limit.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ceb24af..509c8f3 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3739,7 +3739,7 @@
 	if ((bi->bi_size>>9) > queue_max_sectors(q))
 		return 0;
 	blk_recount_segments(q, bi);
-	if (bi->bi_phys_segments > queue_max_phys_segments(q))
+	if (bi->bi_phys_segments > queue_max_segments(q))
 		return 0;
 
 	if (q->merge_bvec_fn)