zenfone6: Add WifiOverlay

Bug: 148617260
Test: Device boots up and connects to wifi networks.
Change-Id: Iec27a6d947a232a42451ef095dc73d1a52327db5
diff --git a/device.mk b/device.mk
index d82dda8..e753c3f 100755
--- a/device.mk
+++ b/device.mk
@@ -192,8 +192,9 @@
 PRODUCT_PACKAGES_DEBUG += \
     update_engine_client
 
-# WiFi Display
+# WiFi
 PRODUCT_PACKAGES += \
-    libnl
+    libnl \
+    WifiOverlay
 
 include vendor/qcom/opensource/display-commonsys-intf/config/display-product-system.mk
\ No newline at end of file