Add support for the R8A7745 DU (which is very similar to the R8A7794 DU);
it has 2 RGB outputs.
Signed-off-by: NFabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: NBiju Das <biju.das@bp.renesas.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>