[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/xsysace.c b/drivers/block/xsysace.c
index 732ec63..cb27e88 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -458,7 +458,7 @@
 }
 
 /* Get the next read/write request; ending requests that we don't handle */
-struct request *ace_get_next_request(request_queue_t * q)
+struct request *ace_get_next_request(struct request_queue * q)
 {
 	struct request *req;
 
@@ -825,7 +825,7 @@
 /* ---------------------------------------------------------------------
  * Block ops
  */
-static void ace_request(request_queue_t * q)
+static void ace_request(struct request_queue * q)
 {
 	struct request *req;
 	struct ace_device *ace;