dt-bindings: interrupt-controller: renesas,irqc: Add r8a779g0 support

Document support for the Interrupt Controller for External Devices
(INT-EX) 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>
Link: https://lore.kernel.org/r/264cffccfbb1f92657420f5f869236b06a97d958.1713280616.git.geert+renesas@glider.beSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.yaml

@@ -39,6 +39,7 @@ properties:
           - renesas,intc-ex-r8a779a0    # R-Car V3U
           - renesas,intc-ex-r8a779f0    # R-Car S4-8
           - renesas,intc-ex-r8a779g0    # R-Car V4H
+          - renesas,intc-ex-r8a779h0    # R-Car V4M
       - const: renesas,irqc
 
   '#interrupt-cells':