dt-bindings: gpio: renesas,rcar-gpio: Add r8a779g0 support

Document support for the GPIO controller blocks in the Renesas R-Car
V4H (R8A779G0) SoC.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>

Documentation/devicetree/bindings/gpio/renesas,rcar-gpio.yaml

@@ -52,6 +52,7 @@ properties:
           - enum:
               - renesas,gpio-r8a779a0     # R-Car V3U
               - renesas,gpio-r8a779f0     # R-Car S4-8
+              - renesas,gpio-r8a779g0     # R-Car V4H
           - const: renesas,rcar-gen4-gpio # R-Car Gen4
 
   reg: