ASoC: dt-bindings: renesas: add R8A779H0 V4M

Add document for R-Car V4M (R8A779H0).
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/871q7bcew5.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/renesas,rsnd.yaml

@@ -49,6 +49,7 @@ properties:
       # for Gen4 SoC
       - items:
           - const: renesas,rcar_sound-r8a779g0  # R-Car V4H
+          - const: renesas,rcar_sound-r8a779h0  # R-Car V4M
           - const: renesas,rcar_sound-gen4
       # for Generic
       - enum: