usb: dwc3: pci: Properly cleanup resource

Platform device is allocated before adding resources. Make sure to
properly cleanup on error case.

Cc: <stable@vger.kernel.org>
Fixes: f1c7e710 ("usb: dwc3: convert to pcim_enable_device()")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>