Remove DEVICE_PACKAGE_OVERLAYS

Remove DEVICE_PACKAGE_OVERLAYS as PRODUCT_PACKAGE_OVERLAYS is
already defined.

Change-Id: I1e5322d983ec7c9d45e71f6251d425269743fdcf
diff --git a/device-vendor.mk b/device-vendor.mk
index 712acdf..3fe52e1 100644
--- a/device-vendor.mk
+++ b/device-vendor.mk
@@ -22,9 +22,6 @@
 PRODUCT_PACKAGE_OVERLAYS += \
 	vendor/fairphone/fp2-common/overlay
 
-DEVICE_PACKAGE_OVERLAYS += \
-	vendor/fairphone/fp2-common/overlay
-
 # Ringtones
 PRODUCT_COPY_FILES += \
 	vendor/fairphone/media/ringtones/Sunbeam.mp3:system/media/audio/ringtones/Fairphone.mp3 \