Skip mss_scrub with axone system for until we get it working

Currently mss_scrub does not support the axone processor type. This
step must be skipped until support is added.

Change-Id: Ifed4325f3aff93c278413ac125b3a370a900167f
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/81469
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>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Corey V Swenson <cswenson@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>

src/usr/isteps/istep16/call_mss_scrub.C

@@ -55,6 +55,15 @@ void* call_mss_scrub (void *io_pArgs)
 
     do
     {
+        // TODO: 213933 Remove workaround skipping mss_scrub for swift bringup
+        #if CONFIG_AXONE_BRING_UP
+            // There are performance issues and some functional deficiencies
+            // that make background scrub problematic in SIMICs.
+            TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace, ISTEP_FUNC
+                       "Background scrubbing not currently working with Swift systems so it is disabled for now" );
+        break;
+        #endif
+
         if ( Util::isSimicsRunning() )
         {
             // There are performance issues and some functional deficiencies