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/agents/Agents.scala

@@ -5,11 +5,11 @@ package uncore.agents
 import Chisel._
 import cde.{Parameters, Field}
 import junctions.PAddrBits
-import util.ParameterizedBundle
 import uncore.tilelink._
 import uncore.converters._
 import uncore.coherence._
 import uncore.util._
+import util._
 
 case object NReleaseTransactors extends Field[Int]
 case object NProbeTransactors extends Field[Int]

src/main/scala/uncore/agents/Broadcast.scala

@@ -7,6 +7,7 @@ import uncore.coherence._
 import uncore.tilelink._
 import uncore.constants._
 import uncore.util._
+import util._
 import cde.Parameters
 
 class L2BroadcastHub(implicit p: Parameters) extends HierarchicalCoherenceAgent()(p) {

src/main/scala/uncore/agents/Cache.scala

@@ -11,6 +11,7 @@ import uncore.coherence._
 import uncore.tilelink._
 import uncore.constants._
 import uncore.util._
+import util._
 import cde.{Parameters, Field}
 
 case object CacheName extends Field[String]

src/main/scala/uncore/agents/Ecc.scala

@@ -3,7 +3,7 @@
 package uncore.agents
 
 import Chisel._
-import uncore.util._
+import util._
 
 abstract class Decoding
 {

src/main/scala/uncore/agents/Trackers.scala

@@ -6,8 +6,7 @@ import Chisel._
 import uncore.coherence._
 import uncore.tilelink._
 import uncore.util._
-import uncore.util._
-import util.ParameterizedBundle
+import util._
 import cde.{Field, Parameters}
 import scala.math.max