Hide CHTM attributes from ServerWiz

These are lab-only attributes that should not get set by MRW xml.

Change-Id: Ie0579cd33ae32a1a7dfcc2fbe59688ad8fc03bd0
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77942
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Reviewed-by: Prem Shanker Jha <premjha2@in.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Jennifer A Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77955
Reviewed-by: RAJA DAS <rajadas2@in.ibm.com>

src/import/chips/p9/procedures/xml/attribute_info/pm_plat_attributes.xml

@@ -2265,6 +2265,7 @@
     </enum>
     <platInit/>
     <initToZero/>
+    <mrwHide/>
   </attribute>
   <!-- ********************************************************************* -->
   <attribute>
@@ -2286,6 +2287,7 @@
     </enum>
     <platInit/>
     <initToZero/>
+    <mrwHide/>
   </attribute>
   <!-- ********************************************************************* -->
   <attribute>
@@ -2303,6 +2305,7 @@
      <valueType>uint64</valueType>
     <platInit/>
     <initToZero/>
+    <mrwHide/>
   </attribute>
   <!-- ********************************************************************* -->
   <attribute>