range: Add range_overlaps()

Code to support CXL Dynamic Capacity devices will have extent ranges
which need to be compared for intersection not a subset as is being
checked in range_contains().

range_overlaps() is defined in btrfs with a different meaning from what
is required in the standard range code.  Dan Williams pointed this out
in [1].  Adjust the btrfs call according to his suggestion there.

Then add a generic range_overlaps().

Cc: Dan Williams <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: David Sterba <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/all/[email protected]/ [1]
Acked-by: David Sterba <[email protected]>
Reviewed-by: Davidlohr Bueso <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Fan Ni <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Ira Weiny <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

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