[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/sbus/char/jsflash.c

@@ -185,7 +185,7 @@ static void jsfd_read(char *buf, unsigned long p, size_t togo) {
 	}
 }
 
-static void jsfd_do_request(request_queue_t *q)
+static void jsfd_do_request(struct request_queue *q)
 {
 	struct request *req;