block: remove dead queue members

No more users of ->in_flight[] or ->nr_sorted, get rid of them.

Fixes: a1ce35fa ("block: remove dead elevator code")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/blkdev.h

@@ -486,9 +486,6 @@ struct request_queue {
 	unsigned int		dma_pad_mask;
 	unsigned int		dma_alignment;
 
-	unsigned int		nr_sorted;
-	unsigned int		in_flight[2];
-
 	unsigned int		rq_timeout;
 	int			poll_nsec;