Add graph nodes representing the USB connector and its remote
endpoints to the UCSI device and the USB controller respectively.
Add 'usb-role-switch' properties to the DWC3 devices and update
its dual-role mode to 'otg'.
This is in order to describe a connection between the pmic_glink
and the DWC3 device to allow the former to notify the USB controller
when to start up in USB host or peripheral mode.
Change-Id: I2672c643579beb72d061f12566e03f3771176fd3