Depend on support lib preferences

Bug: 24576551
Change-Id: Ic6190bacd3f7582c9bbc8de972da4612bd92421e
diff --git a/src/com/android/settings/VoiceInputOutputSettings.java b/src/com/android/settings/VoiceInputOutputSettings.java
index a264d50..3a8f1a5 100644
--- a/src/com/android/settings/VoiceInputOutputSettings.java
+++ b/src/com/android/settings/VoiceInputOutputSettings.java
@@ -16,12 +16,10 @@
 
 package com.android.settings;
 
-import android.preference.Preference;
-import android.preference.PreferenceCategory;
-import android.preference.PreferenceGroup;
 import android.speech.tts.TtsEngines;
-
-import com.android.settings.voice.VoiceInputHelper;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceCategory;
+import android.support.v7.preference.PreferenceGroup;
 
 /**
  * Settings screen for voice input/output.