Add StorageEscalationApp28 to mts

Test: Forrest
Bug: 178426097

Change-Id: I26cc448773e171b53d8bb34b55e5a6f6edd6acff
diff --git a/tests/tests/permission/StorageEscalationApp28/Android.bp b/tests/tests/permission/StorageEscalationApp28/Android.bp
index a038879..63fceda 100644
--- a/tests/tests/permission/StorageEscalationApp28/Android.bp
+++ b/tests/tests/permission/StorageEscalationApp28/Android.bp
@@ -20,5 +20,6 @@
     test_suites: [
         "cts",
         "general-tests",
+        "mts",
     ],
 }