Change p9_mss_freq_system to write attributes, errors for Cronus

  Honor the maximum support frequencies based on rank configs
  Remove the MEMVPD_FREQ attribute
  Fixup VPD tooling and accessors for new freq attrs
  Fix test case handling of master ranks
  Fix handling of empty MCS in Cronus

Change-Id: I8344ca0bd3e6b8df11a9681dddf9d947d6cc096c
Original-Change-Id: I669ad0e81454f12368b484e826461ee76f7b9079
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/29878
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com>
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55829
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/import/hwpf/fapi2/xml/attribute_info/system_attributes.xml

@@ -46,15 +46,4 @@
     <platInit/>
   </attribute>
   <!-- ********************************************************************* -->
-  <attribute>
-    <id>ATTR_MEMVPD_FREQS_MHZ</id>
-    <targetType>TARGET_TYPE_SYSTEM</targetType>
-    <description>
-      List of memory frequencies supported by the current system.
-    </description>
-    <valueType>uint32</valueType>
-    <array>4</array>
-    <platInit/>
-  </attribute>
-  <!-- ********************************************************************* -->
 </attributes>