Add ART run-tests to the Mainline Test Suite (MTS).

Note: For simplicity, all ART run-tests supported at the build level
are included in MTS, even ones which are currently known to fail at
run-time -- we can filter the tests to execute at the test plan level
if needed.

Test: Run `m mts` and check the contents of the MTS package
      (`out/host/linux-x86/mts/android-mts.zip`)
Bug: 167385698
Change-Id: I47013a92cdda0dd7f819eca6e644a4cb2b3c2ca5
diff --git a/test/Android.bp b/test/Android.bp
index 8b84884..68c5110 100644
--- a/test/Android.bp
+++ b/test/Android.bp
@@ -213,7 +213,10 @@
     },
 
     test_config_template: ":art-run-test-template",
-    test_suites: ["general-tests"],
+    test_suites: [
+        "general-tests",
+        "mts",
+    ],
 }
 
 art_cc_test_library {