dt-bindings: serial: google,goldfish-tty: Convert to DT schema

Convert the Google Goldfish TTY binding to DT schema format.
Move the file to the serial directory to match the subsystem.
Update the example node name to 'serial' 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/20260113092602.3197681-2-visitorckw@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: visitorckw

Documentation/devicetree/bindings/goldfish/tty.txt

@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/google,goldfish-tty.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Goldfish TTY
+
+maintainers:
+  - Kuan-Wei Chiu <visitorckw@gmail.com>
+
+allOf:
+  - $ref: /schemas/serial/serial.yaml#
+
+description:
+  Android goldfish TTY device generated by Android emulator.
+
+properties:
+  compatible:
+    const: google,goldfish-tty
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    serial@1f004000 {
+        compatible = "google,goldfish-tty";
+        reg = <0x1f004000 0x1000>;
+        interrupts = <12>;
+    };