Add memdiags scrub capability

Change-Id: I1f42c836a8fc4ff3ca31401ec53f2a3aeda77513
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/25376
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Tested-by: Jenkins Server
Tested-by: Hostboot CI
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/70340
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/import/chips/p9/procedures/xml/error_info/p9_memory_mss_lib.xml

@@ -43,6 +43,7 @@
     <scomRegister>MCBIST_CCS_MODEQ</scomRegister>
     <scomRegister>MCBIST_CCS_STATQ</scomRegister>
     <scomRegister>MCBIST_CCS_CNTLQ</scomRegister>
+    <scomRegister>MCBIST_MCBMCATQ</scomRegister>
   </registerFfdc>
 
   <hwpError>