mako: apply hdmi audio policy

Change-Id: Iff5e4eb178e098fa02768112b9e095f69ddf2cd9
diff --git a/audio_policy.conf b/audio_policy.conf
index 6b19fdc..d8230c3 100644
--- a/audio_policy.conf
+++ b/audio_policy.conf
@@ -26,7 +26,7 @@
         sampling_rates 44100
         channel_masks AUDIO_CHANNEL_OUT_STEREO
         formats AUDIO_FORMAT_PCM_16_BIT
-        devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO
+        devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL
         flags AUDIO_OUTPUT_FLAG_PRIMARY
       }
     }