libnvdimm, btt: add support for blk integrity

libnvdimm, btt: add support for blk integrity

Orabug: 22913653

Support multiple block sizes (sector + metadata) using the blk integrity
framework. This registers a new integrity template that defines the
protection information tuple size based on the configured metadata size,
and simply acts as a passthrough for protection information generated by
another layer. The metadata is written to the storage as-is, and read back
with each sector.

Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
(cherry picked from commit 41cd8b70c37ace40077c8d6ec0b74b983178c192)
Signed-off-by: Dan Duval <dan.duval@oracle.com>