dt-bindings: watchdog: re-order entries to match coding convention

The Devicetree bindings coding convention, as used in most of the files
and expressed in Documentation/devicetree/bindings/example-schema.yaml,
expects:
1. "allOf:" block just before "properties:" (or after "required:" for
   more complex cases),
2. additionalProperties/unevaluatedProperties at the end of the file,
   just before the examples section.

Re-order few schemas to match the convention to avoid repeating review
comments for new patches using existing code as template.  No functional
changes.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231105184154.43700-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>