block: move bio_integrity_{intervals,bytes} into blkdev.h
This allows bio_integrity_bytes() to be called from drivers instead of open coding it. Acked-by: NMartin K. Petersen <martin.petersen@oracle.com> Signed-off-by: NGreg Edwards <gedwards@ddn.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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