block: Generalize chunk_sectors support as boundary support

The purpose of the chunk_sectors limit is to ensure that a mergeble request
fits within the boundary of the chunck_sector value.

Such a feature will be useful for other request_queue boundary limits, so
generalize the chunk_sectors merge code.

This idea was proposed by Hannes Reinecke.

Reviewed-by: Martin K. Petersen <[email protected]>
Signed-off-by: John Garry <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Acked-by: Darrick J. Wong <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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