tile: BaseTile refactor, pt 1

* Make dts generation reusable across tile subclasses
* First attempt to standardize tile IO nodes and connect methods
* hartid => hartId when talking about scala Ints

src/main/scala/rocket/PTW.scala

@@ -287,7 +287,7 @@ class PTW(n: Int)(implicit edge: TLEdgeOut, p: Parameters) extends CoreModule()(
 }
 
 /** Mix-ins for constructing tiles that might have a PTW */
-trait CanHavePTW extends HasHellaCache {
+trait CanHavePTW extends HasHellaCache { this: BaseTile =>
   implicit val p: Parameters
   val module: CanHavePTWModule
   var nPTWPorts = 1