dt-bindings: display: bridge: renesas,lvds: Document r8a77961 bindings

Document the R-Car M3-W+ (R8A77961) SoC in the R-Car LVDS encoder
bindings.
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Documentation/devicetree/bindings/display/bridge/renesas,lvds.yaml

@@ -28,6 +28,7 @@ properties:
       - renesas,r8a7793-lvds # for R-Car M2-N compatible LVDS encoders
       - renesas,r8a7795-lvds # for R-Car H3 compatible LVDS encoders
       - renesas,r8a7796-lvds # for R-Car M3-W compatible LVDS encoders
+      - renesas,r8a77961-lvds # for R-Car M3-W+ compatible LVDS encoders
       - renesas,r8a77965-lvds # for R-Car M3-N compatible LVDS encoders
       - renesas,r8a77970-lvds # for R-Car V3M compatible LVDS encoders
       - renesas,r8a77980-lvds # for R-Car V3H compatible LVDS encoders