usb: dwc2: fix duplicate argument warning

Fix a duplicate argument warning reported by 0-DAY kernel test
infrastructure in the following patch:
77dbf713 usb: dwc2: host: add disconnect interrupt to host only interrupts

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>