Fix extended image boot order.
Fix extended image boot order.

Change-Id: I0213266209bbe8eb83babefc334818bd3c73f648
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/650
Tested-by: Jenkins Server
Reviewed-by: Mark W. Wenning <32e1305d9513301b64a3e92b63a7c80399d0fb59@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

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