Pass the gendisk to blkcg_schedule_throttle as part of moving the
blk-cgroup infrastructure to be gendisk based.  Remove the unused
!BLK_CGROUP stub while we're at it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NAndreas Herrmann <aherrmann@suse.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-17-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>