The IPU3 is documented using Doxygen within the code. Include the IPU3 IPA as part of the doxygen build sources. This will ideally be split to its own 'section' of the doxygen output. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>