Fix page rounding issue in malloc.
Fix page rounding issue in malloc.

Change-Id: I22c7d2b7c4d9d77b235efd6a3e0ff9280ac8a854
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/143
Tested-by: Jenkins Server
Reviewed-by: Nicholas E. Bofferding <fb8db48116bc8a69e29dd8cdb037246f232f4af5@us.ibm.com>

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