Marking a flaky test as such

Excluding it from presubmit till the flakiness can be fixed.

Test: atest --test-mapping

Bug: 172318004
Change-Id: Iebf5e03df0fb05abc798a66486eea85687da2060

services/tests/servicestests/src/com/android/server/job/BackgroundRestrictionsTest.java

@@ -41,6 +41,7 @@ import android.provider.Settings;
 import android.util.Log;
 
 import androidx.test.InstrumentationRegistry;
+import androidx.test.filters.FlakyTest;
 import androidx.test.filters.LargeTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -131,6 +132,7 @@ public class BackgroundRestrictionsTest {
     }
 
     @Test
+    @FlakyTest
     public void testPowerWhiteList() throws Exception {
         scheduleAndAssertJobStarted();
         setAppOpsModeAllowed(false);