Fixed makefile so CtsAutoFillServiceTestCases is not installed as system app.

Fixes: 37995900
Test: CtsAutoFillServiceTestCases pass

Change-Id: I562afe809c0d099d5b23bf21a77c28f0dd5cb005
diff --git a/tests/autofillservice/Android.mk b/tests/autofillservice/Android.mk
index 37605af..f4437f7 100644
--- a/tests/autofillservice/Android.mk
+++ b/tests/autofillservice/Android.mk
@@ -16,8 +16,12 @@
 
 include $(CLEAR_VARS)
 
+# Don't include this package in any target.
 LOCAL_MODULE_TAGS := optional
 
+# When built, explicitly put it in the data partition.
+LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
+
 LOCAL_STATIC_JAVA_LIBRARIES := \
     compatibility-device-util \
     ctstestrunner \