This fixes the commit: 1cd8fd28 ("usb: gadget: dummy_hcd: add
SuperSpeed support").

In the case of ClearPortFeature and USB_PORT_FEAT_POWER, simply clear
the right bit regardless of what the wValue is.
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NYuyang Du <yuyang.du@intel.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>