Play tone when RTT upgrade received

When the device receives an RTT upgrade request from the remote user, or
when the IMS stack auto-upgrades an RTT call mid-call, play a tone to
alert the user.

Fixes: 171587427
Test: manual

Change-Id: Ib21b17d0209dde20d048b72e8d0a626e7c4c8e33
Merged-In: Ib21b17d0209dde20d048b72e8d0a626e7c4c8e33