Fold uncore constants into TileLinkConfiguration, update coherence API

rocket/src/main/scala/dpath.scala

@@ -9,7 +9,7 @@ import uncore.constants.AddressConstants._
 class Datapath(implicit conf: RocketConfiguration) extends Component
 {
   val io = new Bundle {
-    val host  = new HTIFIO(conf.lnConf.nClients)
+    val host  = new HTIFIO(conf.tl.ln.nClients)
     val ctrl  = (new CtrlDpathIO).flip
     val dmem = new HellaCacheIO()(conf.dcache)
     val ptw = (new DatapathPTWIO).flip