Remove unused code

Author: yilun-zhangs

code/src/common/audio_defines.h

@@ -25,20 +25,6 @@
 #define LIMITER_ReleaseSec 0.200f
 #define LIMITER_LookAhead 240
 
-typedef enum {
-  CHANNELUNKNOWN = 0,
-  CHANNELMONO,
-  CHANNELSTEREO,
-  CHANNEL51,
-  CHANNEL512,
-  CHANNEL514,
-  CHANNEL71,
-  CHANNEL712,
-  CHANNEL714,
-  CHANNEL312,
-  CHANNELBINAURAL
-} channelLayout;
-
 #define MAX_CHANNELS 12
 #define MAX_OUTPUT_CHANNELS 24
 #define MAX_DELAYSIZE 4096