blk-mq-dma: require unmap caller provide p2p map type

blk-mq-dma: require unmap caller provide p2p map type

In preparing for integrity dma mappings, we can't rely on the request
flag because data and metadata may have different mapping types.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20250813153153.3260897-4-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>