Fix: xcc treats an undefined macro as 0 by default

lib_xua/src/core/ports/audioports.xc

@@ -72,6 +72,9 @@ void ConfigAudioPorts(
 
     if(!isnull(p_lrclk))
     {
+        #ifndef I2S_TDM_LRCLK_EDGES
+        #define I2S_TDM_LRCLK_EDGES 1
+        #endif
         /* Clock LR clock from bit clock-block */
         #if((XUA_PCM_FORMAT == XUA_PCM_FORMAT_TDM)&&(I2S_TDM_LRCLK_EDGES==0))
         set_port_inv(p_lrclk);//反向lrclk的输出