dts: usb-c: Introduce usb-c-connector

A USB TypeC connector has many peripherals associated with
it and the DTS binding in this commit provides a way to group
peripherals and properties in a device tree.
This binding is used with the USB-C Subsytem.

This is based on Linux, documentation:
https://www.kernel.org/doc/Documentation/devicetree/bindings/connector/usb-connector.yaml



Signed-off-by: Sam Hurst <sbh1187@gmail.com>