usb: dwc2: gadget: remove incorrect file reference

The file and folder movements resulted in the incorrect reference.
So for better code maintainability, let's remove it.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc2/gadget.c

 /**
- * linux/drivers/usb/gadget/s3c-hsotg.c
- *
  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *