dm: cleanup open_table_device

dm: cleanup open_table_device

[ Upstream commit 2165c7a2d5bc82e1838ad528855dc5376d35933d ]

Move all the logic for allocation the table_device and linking it into
the list into the open_table_device.  This keeps the code tidy and
ensures that the table_devices only exist in fully initialized state.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Mike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20221115141054.1051801-4-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: 850af5d876bb ("dm: track per-add_disk holder relations in DM")
Signed-off-by: Sasha Levin <sashal@kernel.org>