dt-bindings: interrupt-controller: Convert snps,arc700-intc to DT schema

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

Link: https://lore.kernel.org/r/20250505144826.1292329-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/snps,arc700-intc.txt

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/snps,arc700-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARC700 incore Interrupt Controller
+
+maintainers:
+  - Vineet Gupta <vgupta@kernel.org>
+
+description: >
+  The core interrupt controller provides 32 prioritized interrupts (2 levels)
+  to ARC700 core.
+
+  intc accessed via the special ARC AUX register interface, hence "reg" property
+  is not specified.
+
+properties:
+  compatible:
+    const: snps,arc700-intc
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    description: An interrupt number 0-31
+    const: 1
+
+required:
+  - compatible
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller {
+        compatible = "snps,arc700-intc";
+        interrupt-controller;
+        #interrupt-cells = <1>;
+    };