block: Rename blk_queue_max_sectors to blk_queue_max_hw_sectors

The block layer calling convention is blk_queue_<limit name>.
blk_queue_max_sectors predates this practice, leading to some confusion.
Rename the function to appropriately reflect that its intended use is to
set max_hw_sectors.

Also introduce a temporary wrapper for backwards compability.  This can
be removed after the merge window is closed.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index d1fd032..1a325fb 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -242,7 +242,7 @@
 	}
 
 	/* xd_maxsectors depends on controller - so set after detection */
-	blk_queue_max_sectors(xd_queue, xd_maxsectors);
+	blk_queue_max_hw_sectors(xd_queue, xd_maxsectors);
 
 	for (i = 0; i < xd_drives; i++)
 		add_disk(xd_gendisk[i]);