ucbhelper::InteractionAuthFallback::getCode() can be an implementation detail

Change-Id: I4967e5e12aa348692b3b954398faede843db381b
Missing @since tags

Change-Id: I6393e839a7aee88bb8580837db8c78550d9b6475
Marking as published was not intentional

Change-Id: Ic0d5ed7824f4897708a81617521367af61562401