block: sed-opal: unify retrieval of table columns

Instead of having multiple places defining the same argument list to get
a specific column of a sed-opal table, provide a generic version and
call it from those functions.

Co-authored-by: David Kozub <[email protected]>
Signed-off-by: Jonas Rabenstein <[email protected]>
Signed-off-by: David Kozub <[email protected]>
Reviewed-by: Scott Bauer <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jon Derrick <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

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