Rename reg/unreg OnSubscriptionsChangedListener.

To addOnSubscriptionsChangedListener and
removeOnSubscriptionsChangedListener.

Bug: 18984103
Change-Id: I6636905093812af89c1c3702840e44c8c5ea891f
diff --git a/src/com/android/mms/service/MmsConfigManager.java b/src/com/android/mms/service/MmsConfigManager.java
index 551ad80..de1522c 100644
--- a/src/com/android/mms/service/MmsConfigManager.java
+++ b/src/com/android/mms/service/MmsConfigManager.java
@@ -94,7 +94,7 @@
 
         // Register for SubscriptionInfo list changes which is guaranteed
         // to invoke onSubscriptionsChanged the first time.
-        SubscriptionManager.from(mContext).registerOnSubscriptionsChangedListener(
+        SubscriptionManager.from(mContext).addOnSubscriptionsChangedListener(
                 mOnSubscriptionsChangedListener);
     }