usb: dwc2: add optional usb ecc reset bit

The dwc2 USB controller in Stratix10 has an additional ECC reset bit that
needs to get de-asserted in order for the controller to work properly.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>