audio: Add support for bluetooth voice calls

Change-Id: Ic63b7c09ed7401ab72824a406db333e3fbce780b
diff --git a/audio/audio_hw.h b/audio/audio_hw.h
index 45c3407..ca90fef 100644
--- a/audio/audio_hw.h
+++ b/audio/audio_hw.h
@@ -381,6 +381,7 @@
     bool  in_call;
     float volume;
     bool  bluetooth_nrec;
+    bool  bluetooth_wb;
     void  *session;
 };