ublk: remove UBLK_IO_F_INTEGRITY

The ublk protocol has no mechanism to actually transfer the integrity
metadata, so don't define this flag, which requires that an integrity
payload is attached to a bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220718063013.335531-1-hch@lst.de


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