wlan: Compilation fix

Change-Id: I607354eae3e463193d8ea6a2d8f97f609c4feef7
diff --git a/Android.mk b/Android.mk
index c9ad61f..5968582 100644
--- a/Android.mk
+++ b/Android.mk
@@ -138,7 +138,7 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE              := $(WLAN_CHIPSET)_wlan.ko
 LOCAL_MODULE_KBUILD_NAME  := wlan.ko
-LOCAL_MODULE_TAGS         := debug
+LOCAL_MODULE_TAGS         := optional
 LOCAL_MODULE_DEBUG_ENABLE := true
 ifeq ($(PRODUCT_VENDOR_MOVE_ENABLED), true)
     ifeq ($(WIFI_DRIVER_INSTALL_TO_KERNEL_OUT),true)