Usb Gadget: Add UVC to Usb Gadget interface

UVC Gadget Function is required for DeviceAsWebcam service that lets
Android Devices be used as Webcam when connected to hosts. This CL adds
the UVC GadgetFunction to the USB Gadget interface.

Bug: 242344221
Test: Manually tested that the HAL and the framework pick up the new
      GadgetFunction
Change-Id: I93acf458f279500320ffc5abd55f139d3d768101