Mark failing tests to exclude from presubmit.

Test: compiles
Bug: 138223627
Change-Id: Id3329853cf3945f91410c5e9171de08366db7953
diff --git a/hostsidetests/devicepolicy/src/com/android/cts/devicepolicy/MixedManagedProfileOwnerTest.java b/hostsidetests/devicepolicy/src/com/android/cts/devicepolicy/MixedManagedProfileOwnerTest.java
index 34aee5c..95c2349 100644
--- a/hostsidetests/devicepolicy/src/com/android/cts/devicepolicy/MixedManagedProfileOwnerTest.java
+++ b/hostsidetests/devicepolicy/src/com/android/cts/devicepolicy/MixedManagedProfileOwnerTest.java
@@ -316,4 +316,22 @@
     public void testLockTaskAfterReboot_tryOpeningSettings() throws Exception {
         super.testLockTaskAfterReboot_tryOpeningSettings();
     }
+
+    @Override
+    @FlakyTest(bugId = 138223627)
+    public void testLockTask_defaultDialer() throws Exception {
+        super.testLockTask_defaultDialer();
+    }
+
+    @Override
+    @FlakyTest(bugId = 138223627)
+    public void testLockTask_emergencyDialer() throws Exception {
+        super.testLockTask_emergencyDialer();
+    }
+
+    @Override
+    @FlakyTest(bugId = 138223627)
+    public void testLockTask_exitIfNoLongerWhitelisted() throws Exception {
+        super.testLockTask_exitIfNoLongerWhitelisted();
+    }
 }