dt-bindings: can: renesas,rcar-canfd: Document r8a779a0 support

Document support for rcar_canfd on R8A779A0 (V3U) SoCs.

Link: https://lore.kernel.org/all/20220309162609.3726306-5-uli+renesas@fpond.euSigned-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml

@@ -35,6 +35,8 @@ properties:
               - renesas,r9a07g044-canfd    # RZ/G2{L,LC}
           - const: renesas,rzg2l-canfd     # RZ/G2L family
 
+      - const: renesas,r8a779a0-canfd      # R-Car V3U
+
   reg:
     maxItems: 1