get rid of unused imports

rocket/src/main/scala/csr.scala

@@ -8,7 +8,7 @@ import Instructions._
 import cde.{Parameters, Field}
 import uncore._
 import scala.math._
-import junctions.{AddrHashMap, GlobalAddrMap}
+import junctions.AddrHashMap
 
 class MStatus extends Bundle {
   val prv = UInt(width = PRV.SZ) // not truly part of mstatus, but convenient

rocket/src/main/scala/dma.scala

@@ -3,7 +3,7 @@ package rocket
 import Chisel._
 import uncore._
 import uncore.DmaRequest._
-import junctions.{ParameterizedBundle, AddrHashMap, GlobalAddrMap}
+import junctions.{ParameterizedBundle, AddrHashMap}
 import cde.Parameters
 
 trait HasClientDmaParameters extends HasCoreParameters with HasDmaParameters {