audio: Add support for voice session mic mute

Change-Id: I5277736fffcb4511e4a7adb2e3e10090dcab484c
diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index d869ae4..7783ae6 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -4080,7 +4080,7 @@
     adev->mic_mute = state;
 
     if (adev->mode == AUDIO_MODE_IN_CALL) {
-        /* TODO */
+        set_voice_session_mic_mute(adev->voice.session, state);
     }
 
     pthread_mutex_unlock(&adev->lock);