Move a bunch more things into util package

A lot of utility code was just being imported willy-nilly from one
package to another. This moves the common code into util to make things
more sensible. The code moved were

 * The AsyncQueue and AsyncDecoupledCrossing from junctions.
 * All of the code in rocket's util.scala
 * The BlackBox asynchronous reset registers from uncore.tilelink2
 * The implicit definitions from uncore.util

src/main/scala/uncore/devices/Bram.scala

@@ -6,6 +6,7 @@ import unittest.UnitTest
 import junctions._
 import uncore.tilelink._
 import uncore.util._
+import util._
 import HastiConstants._
 
 class BRAMSlave(depth: Int)(implicit val p: Parameters) extends Module

src/main/scala/uncore/devices/Debug.scala

@@ -5,8 +5,7 @@ package uncore.devices
 import Chisel._
 import junctions._
 import uncore.tilelink._
-import uncore.util._
-import util.ParameterizedBundle
+import util._
 import cde.{Parameters, Config, Field}
 
 // *****************************************

src/main/scala/uncore/devices/Prci.scala

@@ -3,11 +3,11 @@
 package uncore.devices
 
 import Chisel._
-import rocket.Util._
 import junctions._
 import junctions.NastiConstants._
 import uncore.tilelink2._
 import uncore.util._
+import util._
 import scala.math.{min,max}
 import cde.{Parameters, Field}