Verify ringtone from ringtone picker is audio

To improve privacy.

Bug: 221041256
Test: atest com.android.settings.DefaultRingtonePreferenceTest
Change-Id: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
Merged-In: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
(cherry picked from commit e4c22580c9a66a3d5523782c2daa707531210227)
(cherry picked from commit f288d3a31bfc96e9680eaab2a312964ca1062f34)
Merged-In: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
2 files changed