Remove AUDIO_CHANNEL_OUT_SURROUND

Change-Id: Id163902dd2c83200201012ffb704d338e81ea471
diff --git a/include/system/audio.h b/include/system/audio.h
index 7b10605..1b7d81a 100644
--- a/include/system/audio.h
+++ b/include/system/audio.h
@@ -224,10 +224,6 @@
                                   AUDIO_CHANNEL_OUT_FRONT_RIGHT |
                                   AUDIO_CHANNEL_OUT_SIDE_LEFT |
                                   AUDIO_CHANNEL_OUT_SIDE_RIGHT),
-    AUDIO_CHANNEL_OUT_SURROUND = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
-                                  AUDIO_CHANNEL_OUT_FRONT_RIGHT |
-                                  AUDIO_CHANNEL_OUT_FRONT_CENTER |
-                                  AUDIO_CHANNEL_OUT_BACK_CENTER),
     AUDIO_CHANNEL_OUT_5POINT1  = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
                                   AUDIO_CHANNEL_OUT_FRONT_RIGHT |
                                   AUDIO_CHANNEL_OUT_FRONT_CENTER |