Force UCD Updates on each IPL

This commit updates the existing ATTR_UCD_MFR_REVISION_OVERRIDE to
be non-zero such that it will force UCD updates on ZZ and Zeppelin
systems on each IPL.

Change-Id: I35e6aa7b990e45b16d2f3ce782c74f60d7668471
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/75615
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>
Reviewed-by: Ilya Smirnov <ismirno@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/targeting/common/xmltohb/attribute_types.xml

@@ -8111,9 +8111,11 @@
         the UCD device rather than the actual value from the device.
     </description>
     <simpleType>
-      <uint16_t/>
+      <uint16_t>
+        <default>1</default>
+      </uint16_t>
     </simpleType>
-    <persistency>volatile-zeroed</persistency>
+    <persistency>volatile</persistency>
     <readable/>
     <no_export/>
   </attribute>