dt-bindings: mmc: renesas,sdhi: Document R-Car V4H support

Document support for the SD Card/MMC Interface on the Renesas R-Car V4H
(R8A779G0) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/7ee7fdb6a46fc9f0e50c2b803ede6b4b2fdfa450.1665558324.git.geert+renesas@glider.beSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml

@@ -64,6 +64,7 @@ properties:
           - enum:
               - renesas,sdhi-r8a779a0  # R-Car V3U
               - renesas,sdhi-r8a779f0  # R-Car S4-8
+              - renesas,sdhi-r8a779g0  # R-Car V4H
           - const: renesas,rcar-gen4-sdhi # R-Car Gen4
 
   reg: