Add makefile so package manager test apks can get buitl from root.

Change-Id: I89e3d50793a48a404c7d8e5699baea8b195b7684
diff --git a/core/tests/coretests/apks/Android.mk b/core/tests/coretests/apks/Android.mk
new file mode 100644
index 0000000..4670e21
--- /dev/null
+++ b/core/tests/coretests/apks/Android.mk
@@ -0,0 +1,5 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+# build sub packages
+include $(call all-makefiles-under,$(LOCAL_PATH))