Increase trace buffer size to avoid hang between traces and PRD.

Change-Id: I5e36ae25adda19bc3a6d6bfc7c5abacaf4320482
CQ: SW407513
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/51102
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/trace/buffer.H

@@ -81,7 +81,7 @@ namespace TRACE
              *  @param[in] i_maxPages - Maximum number of pages to consume
              *                          before 'claimEntry' blocks.
              */
-            Buffer(TRACEDAEMON::Daemon * i_daemon, size_t i_maxPages = 4);
+            Buffer(TRACEDAEMON::Daemon * i_daemon, size_t i_maxPages = 16);
 #endif
             /** @brief Claim an entry from the buffer to write data to.
              *