dt-bindings: net: fsl,qoriq-mc-dpmac: using unevaluatedProperties

Replace additionalProperties with unevaluatedProperties because it have
allOf: $ref: ethernet-controller.yaml#.

Remove all properties, which already defined in ethernet-controller.yaml.

Fixed below CHECK_DTBS warnings:
arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dtb:
   fsl-mc@80c000000: dpmacs:ethernet@11: 'fixed-link' does not match any of the regexes: 'pinctrl-[0-9]+'
        from schema $id: http://devicetree.org/schemas/misc/fsl,qoriq-mc.yaml#



Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240811184049.3759195-1-Frank.Li@nxp.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>