dt-bindings: interrupt-controller: ti,sci-inta: Add missing "#interrupt-cells" to example

Enabling dtc interrupt_provider check reveals the example is missing
the "#interrupt-cells" property as it is a dependency of
"interrupt-controller".

Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.yaml

@@ -109,6 +109,7 @@ examples:
             compatible = "ti,sci-inta";
             reg = <0x0 0x33d00000 0x0 0x100000>;
             interrupt-controller;
+            #interrupt-cells = <0>;
             msi-controller;
             interrupt-parent = <&main_navss_intr>;
             ti,sci = <&dmsc>;