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

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>