Mark libcore-memory-metrics-tests as not unit tests

This is not currently a unit tests and we are trying to switch java_host_Test to unit tests
true.

Change-Id: I8c84b074f8c07c3fe097d87a6414bdefe8508a53
Test: presubmit
Bug: 180736967
diff --git a/metrictests/memory/host/Android.bp b/metrictests/memory/host/Android.bp
index ece6c22..10ee832 100644
--- a/metrictests/memory/host/Android.bp
+++ b/metrictests/memory/host/Android.bp
@@ -28,4 +28,7 @@
         "ahat",
     ],
     test_suites: ["general-tests"],
+    test_options: {
+        unit_test: false,
+    },
 }