dt-bindings: power: supply: max17040: switch to unevaluatedProperties

Required for validation of power-supplies from power-supply.yaml.
Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/maxim,max17040.yaml

@@ -62,7 +62,7 @@ required:
   - compatible
   - reg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |