PSTATE_PARAMETER_BLOCK structure alignment and error handling

- Add VDM EC attribute to generally disable VDMs on Nimbus DD1

Change-Id: Ibb2539d8ce307e43aff6e1f79e9991ba5bdd9375
Original-Change-Id: I7743bbff9c8f975074068d760373b8b9b8294d32
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42714
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: Adam S. Hale <adam.samuel.hale@ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

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

@@ -3906,6 +3906,23 @@
         </ec>
       </chip>
     </chipEcFeature>
+  </attribute>
+  <!-- ******************************************************************** -->
+  <attribute>
+    <id>ATTR_CHIP_EC_FEATURE_VDM_NOT_SUPPORTED</id>
+    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+    <description>
+      Voltage Droop Monitor non-support in manufacturing.
+    </description>
+    <chipEcFeature>
+      <chip>
+        <name>ENUM_ATTR_NAME_NIMBUS</name>
+        <ec>
+          <value>0x20</value>
+          <test>LESS_THAN</test>
+        </ec>
+      </chip>
+    </chipEcFeature>
   </attribute>
    <!-- ******************************************************************** -->
     <attribute>