Oh, if we don't add dtoverlay=dwc2, the usb port is driven by dwc_otg
driver by default, if we add dtoverlay=dwc2, then the usb port is driven
by dwc2.

And I tested with only dtoverlay=dwc2 (no dr_mode=peripheral), i could
see usb0 net device both from rpi4 board and my host machine (via
ifconfig -a).

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https://bugs.launchpad.net/bugs/1861070

Title:
  Raspberry Pi 4B: USB OTG is not working

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