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/groundtest/BusMasterTest.scala

@@ -4,7 +4,7 @@ import Chisel._
 import uncore.tilelink._
 import uncore.agents._
 import uncore.coherence.{InnerTLId, OuterTLId}
-import uncore.util._
+import util._
 import junctions.HasAddrMapParameters
 import cde.Parameters
 

src/main/scala/groundtest/CacheFillTest.scala

@@ -4,7 +4,7 @@ import Chisel._
 import uncore.tilelink._
 import uncore.constants._
 import uncore.agents._
-import uncore.util._
+import util._
 import cde.{Parameters, Field}
 
 class CacheFillTest(implicit p: Parameters) extends GroundTest()(p)

src/main/scala/groundtest/Regression.scala

@@ -4,9 +4,8 @@ import Chisel._
 import uncore.tilelink._
 import uncore.constants._
 import uncore.agents._
-import uncore.util._
+import util._
 import junctions.HasAddrMapParameters
-import util.{ParameterizedBundle, SimpleTimer}
 import rocket.HellaCacheIO
 import cde.{Parameters, Field}