p9_pstate_parameter_block: Pound W enhancement for VID Compare

       - Add changes to Compare VID slopes support
       - Added changes for threshold slopes

Change-Id: I6ce9f7630cf8f8bbb19a2914da43c24308c3c7fd
RTC:172523
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/39955
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: CHRISTOPHER M. RIEDL <cmriedl@us.ibm.com>
Reviewed-by: Juan R. Medina <jrmedina@us.ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/40767
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

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

@@ -1902,4 +1902,26 @@
   </attribute>
   <!-- ********************************************************************* -->
 
+  <attribute>
+      <id>ATTR_VDM_VID_COMPARE_BIAS_0P5PCT</id>
+      <targetType>TARGET_TYPE_PROC_CHIP</targetType>
+      <description>
+      VDM Voltage Compare Bias - % of bias (signed twos
+      complement in
+      0.5 percent steps) that is applied to the #W VDM
+      VID Compare before placement in the respective Pstate
+      Paramter Blocks that will be consumed
+      by Hcode.
+      Array of 4 entries: 0 = PowerSave, 1 =
+      Nominal; 2 = Turbo; 3 = UltraTurbo
+      If index 4 is non-zero, the
+      other entries are considered
+      valid.Producer:MRWB.
+      </description>
+      <valueType>int8</valueType>
+      <array>4</array>
+      <initToZero/>
+      <platInit/>
+  </attribute> 
+
 </attributes>