Mock out AsyncRingtonePlayer during Testing

AsyncRingtonePlayer wasn't being correctly Mocked in the
TelecomSystemTests. Since the  Async threads to continue to
run after the tests were completed, The AsyncRingtonePlayer log messages
were interfering with LogTest's Log capturing.

Fix: 28044674
Change-Id: Ic58a0091a969f8eb36b777b859ba08202810221a