dt-bindings: net: ravb: Add support for r8a774c0 SoC

Document RZ/G2E (R8A774C0) SoC bindings.

Signed-off-by: Fabrizio Castro <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Sergei Shtylyov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

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

···
 		R-Car Gen2 and RZ/G1 devices.
 
       - "renesas,etheravb-r8a774a1" for the R8A774A1 SoC.
+      - "renesas,etheravb-r8a774c0" for the R8A774C0 SoC.
       - "renesas,etheravb-r8a7795" for the R8A7795 SoC.
       - "renesas,etheravb-r8a7796" for the R8A7796 SoC.
       - "renesas,etheravb-r8a77965" for the R8A77965 SoC.