add a fake data target.

(cherry picked from commit 3ba7baf14875d3cd360006be7dffe7e4e0cf1882)

Change-Id: I691d4dda65437d3f57e77ed207da406fd1f53355
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 06fdf4d..8ac437e 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -212,6 +212,7 @@
 TARGET_OUT_DATA_KEYCHARS := $(TARGET_OUT_KEYCHARS)
 TARGET_OUT_DATA_ETC := $(TARGET_OUT_ETC)
 TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest
+TARGET_OUT_DATA_FAKE := $(TARGET_OUT_DATA)/fake_packages
 
 TARGET_OUT_CACHE := $(PRODUCT_OUT)/cache