[RFC][PATCH 2/2 v2] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220

From: Chen Yu The Hi6220's usb controller is limited in that it does not support "Split Transactions", so it does not support communicating with low-speed and full-speed devices behind a high-speed hub. Thus it requires a quirk so that we can manually drop the usb speed

[RFC][PATCH 2/2 v2] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220

From: Chen Yu The Hi6220's usb controller is limited in that it does not support "Split Transactions", so it does not support communicating with low-speed and full-speed devices behind a high-speed hub. Thus it requires a quirk so that we can manually drop the usb speed when low/full-speed are