Supports DTMF tone in incallui split.

- Adds accessibility code for short tone.
- Also changed CallModeler listener behaviour

Change-Id: Ia052a877bdf301f478d3fcf4fd1d337dd9bc66ff
diff --git a/src/com/android/phone/CallHandlerServiceProxy.java b/src/com/android/phone/CallHandlerServiceProxy.java
index 5d6f68d..b134310 100644
--- a/src/com/android/phone/CallHandlerServiceProxy.java
+++ b/src/com/android/phone/CallHandlerServiceProxy.java
@@ -57,7 +57,7 @@
         mCallModeler = callModeler;
 
         setupServiceConnection();
-        mCallModeler.setListener(this);
+        mCallModeler.addListener(this);
 
         // start the whole process
         onUpdate(mCallModeler.getFullList(), true);