dt-bindings: net: ravb: Add support for r8a77965 SoC

Add documentation for r8a77965 compatible string to renesas ravb device
tree bindings documentation.

Signed-off-by: Jacopo Mondi <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Acked-by: Sergei Shtylyov <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

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

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       - "renesas,etheravb-r8a7795" for the R8A7795 SoC.
       - "renesas,etheravb-r8a7796" for the R8A7796 SoC.
+      - "renesas,etheravb-r8a77965" for the R8A77965 SoC.
       - "renesas,etheravb-r8a77970" for the R8A77970 SoC.
       - "renesas,etheravb-r8a77980" for the R8A77980 SoC.
       - "renesas,etheravb-r8a77995" for the R8A77995 SoC.