usb: ci_udc: Add function to remove usb device
When unregister gadget driver in ci_udc, the usb device is not removed or stop. This causes next "usb start" fails to work. Add a new interface "usb_remove_ehci_gadget" in usb-uclass to remove the usb device for DM driver. Using "usb_lowlevel_stop" for non-DM driver. Signed-off-by: NYe Li <ye.li@nxp.com> Signed-off-by: NPeng Fan <peng.fan@nxp.com>
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