Make the intent of TTY_PREFERRED_MODE_CHANGED protected

Bug: 197960597
Test: make, manual
Change-Id: Ia22f49c4542fc256feda470314f56a93b4394d3b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 45e3151..0ee9e31 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -22,6 +22,7 @@
 
     <protected-broadcast android:name="android.intent.action.SHOW_MISSED_CALLS_NOTIFICATION"/>
     <protected-broadcast android:name="com.android.server.telecom.MESSAGE_SENT"/>
+    <protected-broadcast android:name="android.telecom.action.TTY_PREFERRED_MODE_CHANGED"/>
 
 
     <!-- Prevents the activity manager from delaying any activity-start