dt-bindings: net: renesas-ravb: Add support for r8a77470 SoC

Add a new compatible string for the RZ/G1C (R8A77470) SoC.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/renesas,ravb.txt

@@ -7,6 +7,7 @@ Required properties:
 - compatible: Must contain one or more of the following:
       - "renesas,etheravb-r8a7743" for the R8A7743 SoC.
       - "renesas,etheravb-r8a7745" for the R8A7745 SoC.
+      - "renesas,etheravb-r8a77470" for the R8A77470 SoC.
       - "renesas,etheravb-r8a7790" for the R8A7790 SoC.
       - "renesas,etheravb-r8a7791" for the R8A7791 SoC.
       - "renesas,etheravb-r8a7792" for the R8A7792 SoC.