Add support for using resource files as incall tones.

Adding support for using an audio file as an incall tone.
Replacing the default Telecom hangup tone with a fancy end call tone
audio file.

Test: Manual
Bug: 78540877
Change-Id: Ifb0506f3d564c92e41f0d40b94ed3aa29a7fdd9b
Merged-In: Ifb0506f3d564c92e41f0d40b94ed3aa29a7fdd9b