Use hostservice to do special wakeup at runtime for open-power systems

Currently HB uses FSP register at runtime to do special wakeup
in open-power systems. It prevents pdbg or sbe from using that
register. HB should shift to hostservices to do special wakeup.

Change-Id: I79db6583550f69e4f19e6f4101237f6140ccb07c
CQ:SW437887
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/62677
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Richard Ward <rward15@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>