Don't include duplicate connections when looking up xbus mapping
Don't include duplicate connections when looking up xbus mapping

Previously in P8 when running the xbus scominit hwp we needed to
include duplicate connections IE xbus0->xbus1 and xbus1->xbus0 when
we look up what to run the xbus scominit hwp on. In p9 the HWP will
initialize both ends of the xbus connection when we pass both ends
into the xbus scominit hardware procedure

Change-Id: I5a0a356e2086b15ee5d25cf350c9a0559ec2084b
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/54726
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>
Tested-by: Jenkins OP HW <0eb0fff262f74a65a832afbcc7b153e391c9a3fd@us.ibm.com>
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Reviewed-by: Matt Derksen <7e9f2fc2ed13c4ee3c2ab17f188630a0f557de86@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot