usb: s3c-otg: Tweak the comments

The driver is actually for the Designware DWC2 controller.
Tweak the comments in the driver to reflect this fact.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/gadget/dwc2_udc_otg_priv.h b/drivers/usb/gadget/dwc2_udc_otg_priv.h
index 5126a9d..3642882 100644
--- a/drivers/usb/gadget/dwc2_udc_otg_priv.h
+++ b/drivers/usb/gadget/dwc2_udc_otg_priv.h
@@ -1,5 +1,5 @@
 /*
- * Samsung S3C on-chip full/high speed USB device controllers
+ * Designware DWC2 on-chip full/high speed USB device controllers
  * Copyright (C) 2005 for Samsung Electronics
  *
  * SPDX-License-Identifier:	GPL-2.0+