Re-enable mss_scrub in istep16 for axone systems

This step was disabled during bringup. Workarounds in place now
so we can call it again.

Change-Id: I6aaaf77173cdcf45771f1072fcab67b09546da86
RTC: 213933
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/83200
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: Matt Derksen <mderkse1@us.ibm.com>
Reviewed-by: Ilya Smirnov <ismirno@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>

src/usr/isteps/istep16/call_mss_scrub.C

@@ -55,14 +55,6 @@ 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() )
         {