dt-bindings: interrupt-controller: Convert ezchip,nps400-ic to DT schema

Convert the EZchip NPS interrupt controller binding to schema
format. It's a straight-forward conversion of the typical interrupt
controller.

Link: https://lore.kernel.org/r/20250505144649.1288786-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/ezchip,nps400-ic.txt

@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ezchip,nps400-ic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EZchip NPS Interrupt Controller
+
+maintainers:
+  - Noam Camus <noamc@ezchip.com>
+
+properties:
+  compatible:
+    const: ezchip,nps400-ic
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+
+required:
+  - compatible
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller {
+        compatible = "ezchip,nps400-ic";
+        interrupt-controller;
+        #interrupt-cells = <1>;
+    };