dt-bindings: soc: add the required property 'additionalProperties'

When I do dt_binding_check for any YAML file, below wanring is always
reported:

xxx/soc/litex/litex,soc-controller.yaml: 'additionalProperties' is a required property
xxx/soc/litex/litex,soc-controller.yaml: ignoring, error in schema:
warning: no schema found in file: xxx/soc/litex/litex,soc-controller.yaml
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201204093813.1275-4-thunder.leizhen@huawei.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/soc/litex/litex,soc-controller.yaml

@@ -28,6 +28,8 @@ required:
   - compatible
   - reg
 
+additionalProperties: false
+
 examples:
   - |
     soc_ctrl0: soc-controller@f0000000 {