auhal: increase ringbuffer size by one second

This will result in approx. 50% utilization
for tta files.

close #11193

modules/audio_output/auhal.c

@@ -57,7 +57,7 @@
 
 #define AOUT_VAR_SPDIF_FLAG 0xf00000
 
-#define AUDIO_BUFFER_SIZE_IN_SECONDS (AOUT_MAX_ADVANCE_TIME / CLOCK_FREQ)
+#define AUDIO_BUFFER_SIZE_IN_SECONDS ((AOUT_MAX_ADVANCE_TIME + CLOCK_FREQ) / CLOCK_FREQ)
 
 
 #define AOUT_VOLUME_DEFAULT             256