dt-bindings: i2c: imx: Add properties and use unevaluatedProperties

Additional properties actually might appear (e.g. power-domains) so
describe all typical properties, reference generic i2c schema and use
unevaluatedProperties to fix dtbs_check warnings like:

arch/arm64/boot/dts/freescale/imx8mn-evk.dt.yaml: i2c@30a20000:
'#address-cells', '#size-cells', 'pmic@25' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

Documentation/devicetree/bindings/i2c/i2c-imx.yaml

···
 maintainers:
   - Wolfram Sang <[e-mail]>
 
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
 properties:
   compatible:
     oneOf:
···
   - interrupts
   - clocks
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |