Adds separate conference call function.

- Also fixes bug on update conference call.

Bug: 10334739
Change-Id: I4f59c3cf12911b175173e76a1551eb0e3999ba3f
diff --git a/src/com/android/phone/CallModeler.java b/src/com/android/phone/CallModeler.java
index 9c7b9dd..b11b825 100644
--- a/src/com/android/phone/CallModeler.java
+++ b/src/com/android/phone/CallModeler.java
@@ -442,7 +442,7 @@
                     }
                 }
             }
-            changed |= oldSet.equals(call.getChildCallIds());
+            changed |= !oldSet.equals(call.getChildCallIds());
         }
 
         /**