RESTRICT AUTOMERGE: add "mcts" tag to MainlineCTS tests.

Change-Id: I11ef65ba06187fb396e813500fab90e39406628b
Test: local build
Bug: 348121703
diff --git a/tests/Android.bp b/tests/Android.bp
index 532ce63..5b5be18 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -29,6 +29,7 @@
         "cts",
         "general-tests",
         "mts-statsd",
+        "mcts-statsd",
     ],
 
     libs: [