Update SBE FIFO to the latest SBE HB spec (1.3a)

Add sbe_sp_intf.H from SBE repository to include SBE variables from SBE

Change-Id: I49aa987ab4b81b94939791571f005aa29338b36e
RTC: 169436
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36560
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>
Reviewed-by: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

Author: Dzuy Nguyen