block: remove the unused blk_queue_state enum

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210920123328.1399408-10-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/blkdev.h

@@ -262,11 +262,6 @@ enum blk_eh_timer_return {
 	BLK_EH_RESET_TIMER,	/* reset timer and try again */
 };
 
-enum blk_queue_state {
-	Queue_down,
-	Queue_up,
-};
-
 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */