drm/rcar-du: Clarify comment regarding plane Y source coordinate

The R8A7790 DU documentation contains further information regarding the
plane Y source coordinate. Update the comment accordingly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2013-06-14 20:54:16 +02:00
commit 9e7db06d3a