dt-bindings: net: renesas,etheravb: Add support for R-Car V4M

Document support for the Renesas Ethernet AVB (EtherAVB-IF) block in the
Renesas R-Car V4M (R8A779H0) SoC.
Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/0212b57ba1005bb9b5a922f8f25cc67a7bc15f30.1709631152.git.geert+renesas@glider.beSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/renesas,etheravb.yaml

@@ -46,6 +46,7 @@ properties:
           - enum:
               - renesas,etheravb-r8a779a0     # R-Car V3U
               - renesas,etheravb-r8a779g0     # R-Car V4H
+              - renesas,etheravb-r8a779h0     # R-Car V4M
           - const: renesas,etheravb-rcar-gen4 # R-Car Gen4
 
       - items: