dt-bindings: watchdog: nxp,pnx4008-wdt: convert txt to yaml

Convert txt file to yaml. Add maintainers from git blame.
Signed-off-by: Nik Bune <n2h9z4@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Link: https://lore.kernel.org/r/20231106175428.162256-1-n2h9z4@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/nxp,pnx4008-wdt.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/nxp,pnx4008-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PNX watchdog timer
+
+maintainers:
+  - Roland Stigge <stigge@antcom.de>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    const: nxp,pnx4008-wdt
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@4003c000 {
+        compatible = "nxp,pnx4008-wdt";
+        reg = <0x4003c000 0x1000>;
+        timeout-sec = <10>;
+    };

Documentation/devicetree/bindings/watchdog/pnx4008-wdt.txt

-* NXP PNX watchdog timer
-
-Required properties:
-- compatible: must be "nxp,pnx4008-wdt"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-
-Optional properties:
-- timeout-sec: contains the watchdog timeout in seconds.
-
-Example:
-
-	watchdog@4003c000 {
-		compatible = "nxp,pnx4008-wdt";
-		reg = <0x4003C000 0x1000>;
-		timeout-sec = <10>;
-	};