Update genHwsvMrwXml.pl to support BRAZOS
Update genHwsvMrwXml.pl to support BRAZOS

  - generate all four nodes

Change-Id: I3d925fa03fc5b15ffd970b5e1f21b3e4120aeb9b
RTC: 51075
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/3356
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

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