Disabling LVext for all P9 parts

LVext is removed in P10, so it was decided to remove LVext for
all of P9 rather than add and then take back.

Change-Id: I51d76174de5eaa91f442e59083afa74b3bd81d37
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42823
Reviewed-by: Joseph J. McGill <jmcgill@us.ibm.com>
Reviewed-by: Jenny Huynh <jhuynh@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: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42826
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Dean Sanner <dsanner@us.ibm.com>
Tested-by: Dean Sanner <dsanner@us.ibm.com>

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

@@ -1376,24 +1376,6 @@
     </chipEcFeature>
   </attribute>
   <!-- ******************************************************************** -->
-  <attribute>
-    <id>ATTR_CHIP_EC_FEATURE_HW371141_HW371628</id>
-    <targetType>TARGET_TYPE_PROC_CHIP</targetType>
-    <description>
-      DD1 only: HW371141 lvext causes unforseen cgc lockouts, bad for performance
-                HW371628 coherency hole in LVEXT also found must turn off LVEXT.
-    </description>
-    <chipEcFeature>
-      <chip>
-        <name>ENUM_ATTR_NAME_NIMBUS</name>
-        <ec>
-          <value>0x20</value>
-          <test>LESS_THAN</test>
-        </ec>
-      </chip>
-    </chipEcFeature>
-  </attribute>
-  <!-- ******************************************************************** -->
   <attribute>
     <id>ATTR_CHIP_EC_FEATURE_HW370687</id>
     <targetType>TARGET_TYPE_PROC_CHIP</targetType>