core: remove fake package timestamps on installclean

Change-Id: Ic07af1f751b301b69fa5cbbb7bf51ad718d54d52
Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/core/cleanbuild.mk b/core/cleanbuild.mk
index 2639cae..9c1bbb8 100644
--- a/core/cleanbuild.mk
+++ b/core/cleanbuild.mk
@@ -186,7 +186,8 @@
 	$(PRODUCT_OUT)/root \
 	$(PRODUCT_OUT)/system \
 	$(PRODUCT_OUT)/dex_bootjars \
-	$(PRODUCT_OUT)/obj/JAVA_LIBRARIES
+	$(PRODUCT_OUT)/obj/JAVA_LIBRARIES \
+	$(PRODUCT_OUT)/fake_packages
 
 # The files/dirs to delete during a dataclean, which removes any files
 # in the staging and emulator data partitions.