Fix ImsMmTelManager API in accordance with the council

Bug: 121190195
Test: atest FrameworksTelephonyTests
Merged-In: I198b104ca0c0f9b77a8fc64486e1fed5d4dcac4d
Change-Id: I198b104ca0c0f9b77a8fc64486e1fed5d4dcac4d
diff --git a/src/java/com/android/ims/ImsConnectionStateListener.java b/src/java/com/android/ims/ImsConnectionStateListener.java
index 8bfab8c..6f6107c 100644
--- a/src/java/com/android/ims/ImsConnectionStateListener.java
+++ b/src/java/com/android/ims/ImsConnectionStateListener.java
@@ -45,7 +45,7 @@
     }
 
     @Override
-    public final void onDeregistered(ImsReasonInfo info) {
+    public final void onUnregistered(ImsReasonInfo info) {
         onImsDisconnected(info);
     }