[BLOCK] Get rid of request_queue_t typedef

Some of the code has been gradually transitioned to using the proper
struct request_queue, but there's lots left. So do a full sweet of
the kernel and get rid of this typedef and replace its uses with
the proper type.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index dec74bd..6b7c02d 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -114,7 +114,7 @@
 				    */
 	struct bio	*bio, *currentbio, **biotail;
 
-	request_queue_t *queue;
+	struct request_queue *queue;
 
 	struct mm_page {
 		dma_addr_t		page_dma;
@@ -357,7 +357,7 @@
 	page->biotail = & page->bio;
 }
 
-static void mm_unplug_device(request_queue_t *q)
+static void mm_unplug_device(struct request_queue *q)
 {
 	struct cardinfo *card = q->queuedata;
 	unsigned long flags;
@@ -541,7 +541,7 @@
 --                              mm_make_request
 -----------------------------------------------------------------------------------
 */
-static int mm_make_request(request_queue_t *q, struct bio *bio)
+static int mm_make_request(struct request_queue *q, struct bio *bio)
 {
 	struct cardinfo *card = q->queuedata;
 	pr_debug("mm_make_request %llu %u\n",