dt-bindings: watchdog: Fix node descriptions in uniphier-wdt example

Drop a parent node of the watchdog as it is not directly necessary.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221213082449.2721-6-hayashi.kunihiko@socionext.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/watchdog/socionext,uniphier-wdt.yaml

@@ -25,12 +25,6 @@ examples:
   - |
     // The UniPhier watchdog should be a subnode of a "syscon" compatible node.
 
-    sysctrl@61840000 {
-        compatible = "socionext,uniphier-ld11-sysctrl",
-                     "simple-mfd", "syscon";
-        reg = <0x61840000 0x10000>;
-
     watchdog {
         compatible = "socionext,uniphier-wdt";
     };
-    };