Revert "This module doesn't build, don't try to."

This reverts commit 4941e210e637fb51ec191fd6cea15acb9ebe88ad.
The original CL causes build result in the parent dir of the source
tree.
diff --git a/tools/vm-tests-tf/Android.mk b/tools/vm-tests-tf/Android.mk
index 71d5fe3..07a3cf8 100644
--- a/tools/vm-tests-tf/Android.mk
+++ b/tools/vm-tests-tf/Android.mk
@@ -42,7 +42,6 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_UNINSTALLABLE_MODULE := true
 LOCAL_IS_HOST_MODULE := true
 LOCAL_MODULE_CLASS := EXECUTABLES
 LOCAL_MODULE := vm-tests-tf