media: dt-bindings: media: renesas,vin: Add device tree support for r8a7742

Add compatible string for r8a7742. No driver change is needed as
"renesas,rcar-gen2-vin" will activate the right code.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/renesas,vin.yaml

@@ -24,6 +24,7 @@ properties:
     oneOf:
       - items:
           - enum:
+              - renesas,vin-r8a7742  # RZ/G1H
               - renesas,vin-r8a7743  # RZ/G1M
               - renesas,vin-r8a7744  # RZ/G1N
               - renesas,vin-r8a7745  # RZ/G1E