usb: s3c-otg: Rename struct s3c_request

The driver is actually for the Designware DWC2 controller.
This patch renames struct s3c_request to reflect this.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/gadget/s3c_udc_otg_priv.h b/drivers/usb/gadget/s3c_udc_otg_priv.h
index a9b6969..68bac69 100644
--- a/drivers/usb/gadget/s3c_udc_otg_priv.h
+++ b/drivers/usb/gadget/s3c_udc_otg_priv.h
@@ -69,7 +69,7 @@
 	int fifo_num;
 };
 
-struct s3c_request {
+struct dwc2_request {
 	struct usb_request req;
 	struct list_head queue;
 };