s390/xpram: mark xpram as non-rotational

xpram is a memory technology. Lets mark that as non-rotational.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/block/xpram.c

@@ -343,6 +343,7 @@ static int __init xpram_setup_blkdev(void)
 			put_disk(xpram_disks[i]);
 			goto out;
 		}
+		queue_flag_set_unlocked(QUEUE_FLAG_NONROT, xpram_queues[i]);
 		blk_queue_make_request(xpram_queues[i], xpram_make_request);
 		blk_queue_logical_block_size(xpram_queues[i], 4096);
 	}