usb: dwc3: Move driver under a subdirectory

dwc3 is big enough to have its own subdirectory.
While here only make it depend on kernel option dwc3 and rk_dwc3
without any SOC options.

Sponsored by:

usb: dwc3: Move driver under a subdirectory

dwc3 is big enough to have its own subdirectory.
While here only make it depend on kernel option dwc3 and rk_dwc3
without any SOC options.

Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D43190

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