drbd: use bdev_alignment_offset instead of queue_alignment_offset

The bdev version does the right thing for partitions, so use that.

Fixes: 9104d31a ("drbd: introduce WRITE_SAME support")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220415045258.199825-7-hch@lst.de


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