fix android.core.vm-tests-tf

- missing LOCAL_JAR_PATH led into not copying the jar contents to device

Change-Id: I30f2d95963f982d7bdf5382b814482dc7ccb803b
diff --git a/tools/vm-tests-tf/Android.mk b/tools/vm-tests-tf/Android.mk
index 44dac66..88f2a53 100644
--- a/tools/vm-tests-tf/Android.mk
+++ b/tools/vm-tests-tf/Android.mk
@@ -18,7 +18,9 @@
 # ============================================================
 include $(CLEAR_VARS)
 
+# custom variables used to generate test description. do not touch!
 LOCAL_TEST_TYPE := vmHostTest
+LOCAL_JAR_PATH := android.core.vm-tests-tf.jar
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)