dt-bindings: net: ravb: Add support for r8a774a1 SoC

Document RZ/G2M (R8A774A1) SoC bindings.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -16,6 +16,7 @@ Required properties:
       - "renesas,etheravb-rcar-gen2" as a fallback for the above
 		R-Car Gen2 and RZ/G1 devices.
 
+      - "renesas,etheravb-r8a774a1" for the R8A774A1 SoC.
       - "renesas,etheravb-r8a7795" for the R8A7795 SoC.
       - "renesas,etheravb-r8a7796" for the R8A7796 SoC.
       - "renesas,etheravb-r8a77965" for the R8A77965 SoC.
@@ -24,7 +25,7 @@ Required properties:
       - "renesas,etheravb-r8a77990" for the R8A77990 SoC.
       - "renesas,etheravb-r8a77995" for the R8A77995 SoC.
       - "renesas,etheravb-rcar-gen3" as a fallback for the above
-		R-Car Gen3 devices.
+		R-Car Gen3 and RZ/G2 devices.
 
 	When compatible with the generic version, nodes must list the
 	SoC-specific version corresponding to the platform first followed by