PRD: Threshold and mask the multihit error in Ex chiplet.
PRD: Threshold and mask the multihit error in Ex chiplet.

Change-Id: I999859db93a0164a926321ea73099b017252ea25
CQ: SW265526
Backport: release-fips811
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/11639
Tested-by: Jenkins Server
Reviewed-by: Christopher T. Phan <f1526e3d74f0373253bcddf8332b061da0ea5be7@us.ibm.com>
Reviewed-by: Sachin Gupta <285b19a698aa558fba6ab25cf25b393d072fd749@in.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>
Reviewed-by: Zane Shelley <fc96e127d170d6ac0b2af86a8a56f95974ff36e8@us.ibm.com>
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/11727

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