Add Connection.setAudioModeIsVoip

This API will be used by Telecomm to set the call's audio mode.

Change-Id: I29028e614c598d1f2501c4dfdcdbfc929b09f925

telecomm/java/android/telecomm/RemoteConnectionService.java

@@ -193,6 +193,14 @@ final class RemoteConnectionService implements DeathRecipient {
                 mConnection.setFeatures(features);
             }
         }
+
+        /** ${inheritDoc} */
+        @Override
+        public final void setAudioModeIsVoip(String connectionId, boolean isVoip) {
+            if (isCurrentConnection(connectionId)) {
+                mConnection.setAudioModeIsVoip(isVoip);
+            }
+        }
     };
 
     RemoteConnectionService(ComponentName componentName, IConnectionService connectionService)