PRD: Fix makefile for PllPostAnalysis

Change-Id: Ife0c6040de447a7668768504a41bb65b7c97784d
CQ: SW438622
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63703
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Reviewed-by: Brian J. Stegmiller <bjs@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63884
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>

Author: bweisenb

src/usr/diag/prdf/makefile

@@ -43,6 +43,7 @@ include common/plat/cen/prdf_plat_cen.mk
 include common/plat/mem/prdf_plat_mem.mk
 include plat/cen/prdf_plat_cen_hb_only.mk
 include plat/mem/prdf_plat_mem_hb_only.mk
+include plat/p9/prdf_plat_p9_hb_only.mk
 
 VPATH += ${prd_vpath}