Add connection serivce focus api interface

This add new api interface to ConnectionService to support the
connection service focus api.

Bug: 69651192
Test: manually

Change-Id: Iea49d95b086d32a0ebaf8e9f34fe4556953a0fd5
Merged-In: Iea49d95b086d32a0ebaf8e9f34fe4556953a0fd5
diff --git a/telecomm/java/android/telecom/RemoteConnectionService.java b/telecomm/java/android/telecom/RemoteConnectionService.java
index 85906ad..59ce590 100644
--- a/telecomm/java/android/telecom/RemoteConnectionService.java
+++ b/telecomm/java/android/telecom/RemoteConnectionService.java
@@ -213,6 +213,9 @@
         }
 
         @Override
+        public void onConnectionServiceFocusReleased(Session.Info sessionInfo) {}
+
+        @Override
         public void addConferenceCall(
                 final String callId, ParcelableConference parcel, Session.Info sessionInfo) {
             RemoteConference conference = new RemoteConference(callId,