kernel: dwc2: Add missing config symbol definition

DWC2 driver has config symbol CONFIG_USB_DWC2_DEBUG_PERIODIC which
should be defined for the module build.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>

SVN-Revision: 46916

package/kernel/linux/modules/usb.mk

@@ -466,7 +466,8 @@ define KernelPackage/usb-dwc2
 	CONFIG_USB_DWC2_PLATFORM \
 	CONFIG_USB_DWC2_DEBUG=n \
 	CONFIG_USB_DWC2_VERBOSE=n \
-	CONFIG_USB_DWC2_TRACK_MISSED_SOFS=n
+	CONFIG_USB_DWC2_TRACK_MISSED_SOFS=n \
+	CONFIG_USB_DWC2_DEBUG_PERIODIC=n
   FILES:= \
 	$(LINUX_DIR)/drivers/usb/dwc2/dwc2.ko \
 	$(LINUX_DIR)/drivers/usb/dwc2/dwc2_platform.ko