block: remove __blk_get_queue

__blk_get_queue is only called by blk_get_queue, so merge the two.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220721063432.1714609-1-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>