initservice: Flush trace buffers before shutdown syscall

Change-Id: I33ee94cf691d075587537130e55c2dc7c237045b
Signed-off-by: Andrew Jeffery <andrewrj@au1.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/67074
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Corey V. Swenson <cswenson@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/initservice/baseinitsvc/initservice.C

@@ -965,6 +965,9 @@ void InitService::_doShutdown(uint64_t i_status,
                  i_error_info,
                  true); // Force write
 
+    // Ensure all traces get flushed to the console
+    TRAC_FLUSH_BUFFERS();
+
     shutdown(iv_worst_status,
              i_payload_base,
              i_payload_entry,