dt-bindings: timer: Convert snps,archs-rtc to DT schema

Convert the Synopsys ARC HS RTC Timer binding to DT schema format.
It's a straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250506022313.2588796-1-robh@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: robherring

Documentation/devicetree/bindings/timer/snps,archs-rtc.txt

@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/snps,archs-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys ARC Free Running 64-bit Local Timer for ARC HS CPUs
+
+maintainers:
+  - Vineet Gupta <vgupta@synopsys.com>
+
+properties:
+  compatible:
+    const: snps,archs-rtc
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    rtc {
+      compatible = "snps,archs-rtc";
+      clocks = <&core_clk>;
+    };