arm64: dts: imx8qxp-mek: Move port under USB connector

arm64: dts: imx8qxp-mek: Move port under USB connector

Per nxp,ptn5110.yaml, 'port' should be placed under 'connector'.

Do as requested to fix the following dt-schema warning:

imx8qxp-mek.dtb: tcpc@50: connector:ports: 'port@0' is a required property
        from schema $id: http://devicetree.org/schemas/usb/nxp,ptn5110.yaml#
imx8qxp-mek.dtb: tcpc@50: connector: Unevaluated properties are not allowed ('ports' was unexpected)
        from schema $id: http://devicetree.org/schemas/usb/nxp,ptn5110.yaml#

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>