nvme: refactor nvme_add_user_metadata

Pass struct request rather than bio. It helps to kill a parameter, and
some processing clean-up too.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220930062749.152261-7-anuj20.g@samsung.com


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