Add MODIFY_PHONE_STATE permission for changing the audio mode

AudioManager.setMode(MODE_IN_CALL) requires the
  MODIFY_PHONE_STATE permission.

Bug 14964198

Change-Id: I932284b9baa83a6498ad88a87f9f19812282cd71
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1fcfd23..6f54fb9 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -35,6 +35,7 @@
     <uses-permission android:name="android.permission.WRITE_CALL_LOG" />
     <uses-permission android:name="android.permission.BIND_CONNECTION_SERVICE" />
     <uses-permission android:name="android.permission.BIND_INCALL_SERVICE" />
+    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
 
     <!-- Protects the ability to register any PhoneAccount with a capability flags of either
          PhoneAccount#CAPABILITY_CALL_PROVIDER or PhoneAccount#CAPABILITY_SIM_SUBSCRIPTION. -->