blk-mq: Refactor and rename blk_mq_free_map_and_{requests->rqs}()

mainline inclusion
from mainline-v5.16-rc1
commit 645db34e
category: performance
bugzilla: 186917, https://gitee.com/openeuler/kernel/issues/I5N1S5
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=645db34e50501aac141713fb47a315e5202ff890



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Refactor blk_mq_free_map_and_requests() such that it can be used at many
sites at which the tag map and rqs are freed.

Also rename to blk_mq_free_map_and_rqs(), which is shorter and matches the
alloc equivalent.

Suggested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/1633429419-228500-12-git-send-email-john.garry@huawei.com


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

Conflict: commit a846a8e6 ("blk-mq: don't free tags if the tag_set is
used by other device in queue initialztion") is already backported,
blk_mq_free_map_and_rqs() is moved to __blk_mq_update_nr_hw_queues()
instead of blk_mq_realloc_hw_ctxs().
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>