Change trace buffer size from 32k to 8k

Change-Id: I54774ff4ea33105afa1bafc6636b9a8ee2c2f6ef
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/33258
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Martha Broyles <mbroyles@us.ibm.com>
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: William A. Bryan <wilbryan@us.ibm.com>

src/occ_405/ssx_app_cfg.h

@@ -192,7 +192,7 @@ do {                                                                \
 /// The buffer is defined to be quite large in order to accomodate full kernel
 /// and application dumps in the event of problems.
 #ifndef SSXOUT_TRACE_BUFFER_SIZE
-#define SSXOUT_TRACE_BUFFER_SIZE (32 * 1024)
+#define SSXOUT_TRACE_BUFFER_SIZE (8 * 1024)
 #endif
 
 #ifndef APPCFG_USE_EXT_TIMEBASE_FOR_TRACE