HW415692: Make workaround permanent

HW415692 has become a permanent erratum, so make the EC attribute
match any Nimbus EC level.

Change-Id: Ib1e352f3b1252b0d9b89b76a64c27de6cc3a483e
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/45470
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Joseph J. McGill <jmcgill@us.ibm.com>
Reviewed-by: SRINIVAS V. POLISETTY <srinivan@in.ibm.com>
Reviewed-by: PARVATHI RACHAKONDA <prachako@in.ibm.com>

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

@@ -4053,8 +4053,8 @@
       <chip>
         <name>ENUM_ATTR_NAME_NIMBUS</name>
         <ec>
-          <value>0x21</value>
-          <test>LESS_THAN_OR_EQUAL</test>
+          <value>0x10</value>
+          <test>GREATER_THAN_OR_EQUAL</test>
         </ec>
       </chip>
     </chipEcFeature>