dt-bindings: gpio: mvebu: Fix "unevaluatedProperties" to be false

Schemas need "unevaluatedProperties" or "additionalProperties" to be
false in order to disallow undefined properties. Only common or
otherwise incomplete schemas should allow undefined properties.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-mvebu.yaml

@@ -115,7 +115,7 @@ allOf:
       required:
         - reg
 
-unevaluatedProperties: true
+unevaluatedProperties: false
 
 examples:
   - |