dt-bindings: gpio: renesas,rcar-gpio: Add r8a779h0 support

Document support for GPIO controller blocks in the Renesas R-Car V4M
(R8A779H0) SoC.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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

@@ -53,6 +53,7 @@ properties:
               - renesas,gpio-r8a779a0     # R-Car V3U
               - renesas,gpio-r8a779f0     # R-Car S4-8
               - renesas,gpio-r8a779g0     # R-Car V4H
+              - renesas,gpio-r8a779h0     # R-Car V4M
           - const: renesas,rcar-gen4-gpio # R-Car Gen4
 
   reg: