dt-bindings: power: supply: google,goldfish-battery: Convert to DT schema

Convert the Android Goldfish Battery binding to DT schema format.
Move the file to the power/supply directory to match the subsystem.
Update the example node name to 'battery' to comply with generic node
naming standards.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260113092602.3197681-5-visitorckw@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: visitorckw

Documentation/devicetree/bindings/goldfish/battery.txt

@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/google,goldfish-battery.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Android Goldfish Battery
+
+maintainers:
+  - Kuan-Wei Chiu <visitorckw@gmail.com>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+description:
+  Android goldfish battery device generated by Android emulator.
+
+properties:
+  compatible:
+    const: google,goldfish-battery
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    battery@9020000 {
+        compatible = "google,goldfish-battery";
+        reg = <0x9020000 0x1000>;
+        interrupts = <3>;
+    };