[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>

drivers/block/sunvdc.c

@@ -444,7 +444,7 @@ out:
 	return err;
 }
 
-static void do_vdc_request(request_queue_t *q)
+static void do_vdc_request(struct request_queue *q)
 {
 	while (1) {
 		struct request *req = elv_next_request(q);