dt-bindings: irqchip: renesas-irqc: Document r8a7742 bindings

Document SoC specific bindings for RZ/G1H (r8a7742) SoC.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -14,6 +14,7 @@ properties:
     items:
       - enum:
           - renesas,irqc-r8a73a4        # R-Mobile APE6
+          - renesas,irqc-r8a7742        # RZ/G1H
           - renesas,irqc-r8a7743        # RZ/G1M
           - renesas,irqc-r8a7744        # RZ/G1N
           - renesas,irqc-r8a7745        # RZ/G1E