dt-bindings: watchdog: atmel,at91rm9200-wdt: convert txt to yaml

Convert txt file to yaml.
Signed-off-by: Nik Bune <n2h9z4@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230924181959.64264-1-n2h9z4@gmail.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/watchdog/atmel,at91rm9200-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/atmel,at91rm9200-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel AT91RM9200 System Timer Watchdog
+
+maintainers:
+  - Nicolas Ferre <nicolas.ferre@microchip.com>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    const: atmel,at91rm9200-wdt
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@fffffd00 {
+        compatible = "atmel,at91rm9200-wdt";
+        reg = <0xfffffd00 0x10>;
+    };

Documentation/devicetree/bindings/watchdog/atmel-at91rm9200-wdt.txt

-Atmel AT91RM9200 System Timer Watchdog
-
-Required properties:
-- compatible: must be "atmel,at91sam9260-wdt".
-
-Example:
-	watchdog@fffffd00 {
-		compatible = "atmel,at91rm9200-wdt";
-	};