Use prebuilt Gaia app components

Change-Id: I4b9a8247db84a9855d2f30c9b84f481969804ae6

vendorsetup.sh

-# Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+# Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
@@ -339,3 +339,6 @@ fi
 # Don't build sources.xml
 export DISABLE_SOURCES_XML=true
 export LEGACY_USE_JAVA6=true
+
+# Use prebuilt Gaia app components
+export PREBUILD_APP=1