dt-bindings: interrupt-controller: marvell,cp110-icu: Document address-cells

dt-bindings: interrupt-controller: marvell,cp110-icu: Document address-cells

The CP110 ICU children are interrupt controllers and can be referenced
in interrupt-map properties (e.g. in
arch/arm64/boot/dts/marvell/armada-cp11x.dtsi), thus the nodes should
have address-cells property.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20250823163258.49648-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>