add usb device deinit function

core/usbd_core.h

@@ -73,6 +73,7 @@ void usbd_add_endpoint(struct usbd_endpoint *ep);
 bool usb_device_is_configured(void);
 void usbd_configure_done_callback(void);
 int usbd_initialize(void);
+int usbd_deinitialize(void);
 
 #ifdef __cplusplus
 }