MDIA: temporarily increase memdiags timeout max count
MDIA: temporarily increase memdiags timeout max count

  Brazos sometimes runs into memdiags timeout with HB traces
  enabled.  This is a quick fix to get around this issue.

Change-Id: Ia567a08e2106abb12927f57befcd79235b35bc39
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/10772
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

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