[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/include/asm-arm/arch-omap/mailbox.h b/include/asm-arm/arch-omap/mailbox.h
index 4bf0909..7cbed93 100644
--- a/include/asm-arm/arch-omap/mailbox.h
+++ b/include/asm-arm/arch-omap/mailbox.h
@@ -37,7 +37,7 @@
 
 struct omap_mbox_queue {
 	spinlock_t		lock;
-	request_queue_t		*queue;
+	struct request_queue	*queue;
 	struct work_struct	work;
 	int	(*callback)(void *);
 	struct omap_mbox	*mbox;