Mark AppStandbyControllerTests#testEnabledState as Flaky.

This test is ~2% flaky on git_master. Mark as flaky temporarily.
It is not flaky on AOSP so we are leaving it enabled there.

Bug: b/119774928
Change-Id: I4d8365de4a4e2112848c9721836ca2289f7e2804

services/tests/servicestests/src/com/android/server/usage/AppStandbyControllerTests.java

@@ -61,6 +61,7 @@ import android.util.ArraySet;
 import android.view.Display;
 
 import androidx.test.InstrumentationRegistry;
+import androidx.test.filters.FlakyTest;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -416,6 +417,7 @@ public class AppStandbyControllerTests {
     }
 
     @Test
+    @FlakyTest(bugId = 119774928)
     public void testEnabledState() throws Exception {
         TestParoleListener paroleListener = new TestParoleListener();
         mController.addListener(paroleListener);