block: Add T10 Protection Information functions

The T10 Protection Information format is also used by some devices that
do not go through the SCSI layer (virtual block devices, NVMe). Relocate
the relevant functions to a block layer library that can be used without
involving SCSI.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --cc block/Kconfig
Simple merge

diff --cc block/Makefile
Simple merge

diff --cc block/t10-pi.c
Simple merge

diff --cc drivers/scsi/Kconfig
Simple merge

diff --cc drivers/scsi/sd_dif.c
Simple merge

diff --cc include/linux/crc-t10dif.h
Simple merge

diff --cc include/linux/t10-pi.h
Simple merge