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/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 5905936..14b1e25 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2129,7 +2129,7 @@
 
 	blk_queue_logical_block_size(block->request_queue, block->bp_block);
 	max = block->base->discipline->max_blocks << block->s2b_shift;
-	blk_queue_max_sectors(block->request_queue, max);
+	blk_queue_max_hw_sectors(block->request_queue, max);
 	blk_queue_max_phys_segments(block->request_queue, -1L);
 	blk_queue_max_hw_segments(block->request_queue, -1L);
 	/* with page sized segments we can translate each segement into