Remove Hostboot SBE Update checks for Venice and istep
Remove Hostboot SBE Update checks for Venice and istep

This commit re-enables SBE Update support for Brazos/Venice
configurations.  It also re-enables SBE Update running during
an istep call.

Change-Id: I60826c2826593e162147295fb9ddb46e14983861
RTC: 97441
CMVC-Prereq: 925354
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/10971
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

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