Make VortexCoreParams; bring VortexTile into rocketchip.tile

Reduces duplicate declarations.  Need to properly split it out of
rocket-chip later.

src/main/scala/rocket/VortexCore.scala

@@ -8,7 +8,6 @@ import chisel3.util._
 import chisel3.experimental._
 import org.chipsalliance.cde.config.Parameters
 import freechips.rocketchip.tile._
-import tile.VortexTile
 
 class VortexBundleA(
   sourceWidth: Int,