Add the FLAG_BYPASS_INTERRUPTION_POLICY AudioAttributes flag when
launching the ringtone picker so it is not affected by the
current sonification policy, in order to ensure the audibility
of the phone ringtone or default notification being previewed
by the user.
Bug 19407114
Change-Id: Ibd24e3f14e56e67f9e37576a84c97a73f5494074