BLK_MQ_CPU_WORK_BATCH is defined in include/linux/blk-mq.h, but only used
in blk-mq.c, so relocate to block/blk-mq.h
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240719112912.3830443-6-john.g.garry@oracle.comSigned-off-by: Jens Axboe <axboe@kernel.dk>