kernel: fix dwc3 symbols

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45268 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/linux/modules/usb.mk

@@ -497,6 +497,9 @@ define KernelPackage/usb-dwc3
   TITLE:=DWC3 USB controller driver
   KCONFIG:= \
 	CONFIG_USB_DWC3 \
+	CONFIG_USB_DWC3_HOST=y \
+	CONFIG_USB_DWC3_GADGET=n \
+	CONFIG_USB_DWC3_DUAL_ROLE=n \
 	CONFIG_USB_DWC3_DEBUG=n \
 	CONFIG_USB_DWC3_VERBOSE=n
   FILES:= $(LINUX_DIR)/drivers/usb/dwc3/dwc3.ko