Add required audio playback configurations

Adding required audio playback rates according to 6.0 CDD.

Test: Try to generate audio tracks at various rates
Bug: 31648354
Change-Id: I90271b9ffa15ccd89a77f149df888b9a71d4c676
diff --git a/audio_policy.conf b/audio_policy.conf
index f796f40..38b4e49 100644
--- a/audio_policy.conf
+++ b/audio_policy.conf
@@ -27,8 +27,8 @@
   primary {
     outputs {
       primary {
-        sampling_rates 44100
-        channel_masks AUDIO_CHANNEL_OUT_STEREO
+        sampling_rates 8000|11025|16000|22050|24000|44100|48000
+        channel_masks AUDIO_CHANNEL_OUT_MONO|AUDIO_CHANNEL_OUT_STEREO
         formats AUDIO_FORMAT_PCM_16_BIT
         devices AUDIO_DEVICE_OUT_SPEAKER
         flags AUDIO_OUTPUT_FLAG_PRIMARY