PRD: Add PLL signature for Centaur chip

Change-Id: I064e73626da0bf7ded54c7f362bed884c2c37b7e
CQ: SW436671
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/62166
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/62184
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>

src/usr/diag/prdf/common/plat/cen/cen_centaur.rule

@@ -31,6 +31,9 @@ chip cen_centaur
     dump        DUMP_CONTENT_HW;
     scomlen     64;
 
+#Import signatures
+.include "prdfP9ProcMbCommonExtraSig.H";
+
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