PRD: Enable background scrubbing
PRD: Enable background scrubbing

Change-Id: I07575fed6c4a2c5f935c474ad1a52a3af0be51d6

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