engines:io_uring: generate and verify pi for 16b guard

engines:io_uring: generate and verify pi for 16b guard

Generate and verify protection information for 16 bit guard format, for
the nvme backend of io_uring_cmd ioengine. The support is there for
both the cases where metadata is transferred in separate buffer, or
transferred at the end of logical block creating an extended logical
block.
This support also takes into consideration when protection information
resides in last or first 8 bytes of metadata.

Signed-off-by: Ankit Kumar <ankit.kumar@samsung.com>
Link: https://lore.kernel.org/r/20230814145747.114725-8-ankit.kumar@samsung.com
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>