dt-bindings: net: ravb: Document r8a77961 support

Document support for the Ethernet AVB interface in the Renesas R-Car
M3-W+ (R8A77961) SoC.

Update all references to R-Car M3-W from "r8a7796" to "r8a77960", to
avoid confusion between R-Car M3-W (R8A77960) and M3-W+.

No driver update is needed.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -21,7 +21,8 @@ Required properties:
       - "renesas,etheravb-r8a774b1" for the R8A774B1 SoC.
       - "renesas,etheravb-r8a774c0" for the R8A774C0 SoC.
       - "renesas,etheravb-r8a7795" for the R8A7795 SoC.
-      - "renesas,etheravb-r8a7796" for the R8A7796 SoC.
+      - "renesas,etheravb-r8a7796" for the R8A77960 SoC.
+      - "renesas,etheravb-r8a77961" for the R8A77961 SoC.
       - "renesas,etheravb-r8a77965" for the R8A77965 SoC.
       - "renesas,etheravb-r8a77970" for the R8A77970 SoC.
       - "renesas,etheravb-r8a77980" for the R8A77980 SoC.
@@ -37,8 +38,8 @@ Required properties:
 - reg: Offset and length of (1) the register block and (2) the stream buffer.
        The region for the register block is mandatory.
        The region for the stream buffer is optional, as it is only present on
-       R-Car Gen2 and RZ/G1 SoCs, and on R-Car H3 (R8A7795), M3-W (R8A7796),
-       and M3-N (R8A77965).
+       R-Car Gen2 and RZ/G1 SoCs, and on R-Car H3 (R8A7795), M3-W (R8A77960),
+       M3-W+ (R8A77961), and M3-N (R8A77965).
 - interrupts: A list of interrupt-specifiers, one for each entry in
 	      interrupt-names.
 	      If interrupt-names is not present, an interrupt specifier