change package name and sbt project name to rocket

rocket/src/main/scala/nbdcache.scala

@@ -1,4 +1,4 @@
-package Top {
+package rocket
 
 import Chisel._
 import Constants._
@@ -993,5 +993,3 @@ class HellaCacheUniproc extends HellaCache with ThreeStateIncoherence {
   io.mem.req_tag   := wb.io.mem_req.bits.tag.toUFix
   io.mem.req_addr  := wb.io.mem_req.bits.addr
 }
- 
-}