dt-bindings: interrupt-controller: Convert lsi,zevio-intc to DT schema

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

'#interrupt-cells' was missing from the property list, but used in the
example, so add it.

Link: https://lore.kernel.org/r/20250505144711.1289677-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/lsi,zevio-intc.txt

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 Daniel Tang <dt.tangr@gmail.com>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/lsi,zevio-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI-NSPIRE Interrupt Controller
+
+maintainers:
+  - Daniel Tang <dt.tangr@gmail.com>
+
+description: |
+  TI-NSPIRE interrupt controller
+
+properties:
+  compatible:
+    const: lsi,zevio-intc
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller@dc000000 {
+        compatible = "lsi,zevio-intc";
+        interrupt-controller;
+        reg = <0xdc000000 0x1000>;
+        #interrupt-cells = <1>;
+    };