PRD: Fix double inclusion of PRD library in makefile
PRD: Fix double inclusion of PRD library in makefile

Change-Id: I33bae0f369d97b0215cec5da67fe585a286f3f80
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/14857
Tested-by: Jenkins Server
Reviewed-by: Christopher T. Phan <f1526e3d74f0373253bcddf8332b061da0ea5be7@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,csmart/hostboot,alvintpwang/hostboot,csmart/hostboot,csmart/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot