Adds AUDIO_SOURCE_ECHO_REFERENCE in car emulator

Sample usage

```
final AudioAttributes attributes = new AudioAttributes.Builder()
        .setUsage(AudioAttributes.USAGE_MEDIA)
        .setInternalCapturePreset(MediaRecorder.AudioSource.ECHO_REFERENCE)
        .build();
final AudioRecord record = new AudioRecord.Builder()
        .setAudioAttributes(attributes)
        .build();
```

Bug: 129882605
Test: dumpsys media.audio_policy
Change-Id: I72a850aa787599a8f7579cf77899e9b8034f10f0