GPTR/Overlays stage-2 support

-Updated ringClass to include Gptr for Nest/EQ/EX/EC to support
CME/SGPE.
- Bug fixes:
  - big endian to local host endian conversion
  - now also processing Gptr rings in RT_CME/SGPE sysPhases
  - improved error checking, error capturing and trace outs

Change-Id: I6f4ae0d98562764cbdd4944be43ef2cfe4fb8025
Original-Change-Id: Idfc19bdf1b7187d6f75c459f7ddbeda80ccfec28
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/43080
Reviewed-by: Claus M. Olsen <cmolsen@us.ibm.com>
Reviewed-by: Thi N. Tran <thi@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>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

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

@@ -4270,8 +4270,8 @@
     <id>ATTR_CHIP_EC_FEATURE_NO_GPTR_SUPPORT_VIA_MVPD</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>
     <description>
-        indicaes if there is  GPTR support through MVPD which there will NOT be if
-        Nimbus DD1
+        GPTR support through MVPD is available in Nimbus DD2 and Cumulus and
+        will NOT be if Nimbus DD1.
     </description>
     <chipEcFeature>
       <chip>