Revert "Make the intent of TTY_PREFERRED_MODE_CHANGED protected"

This reverts commit 1646f642e13a6592b8f7d7ede4b39d5802b9901c.

Reason for revert: this change caused regression of b/169196062.

Bug: 201580114

Change-Id: Ia577a2360b3bfed50ddb1c80d28716273e65cead
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0ee9e31..45e3151 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -22,7 +22,6 @@
 
     <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