cciss: reinstate proper FIFO order of command queue list

Commit 8a3173de inadvertently changed the ordering when
switching to hlists. Change to regular list heads so we
can use tail list adds, this improves performance.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index ae340ff..7915dd4 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -103,8 +103,8 @@
 	struct access_method access;
 
 	/* queue and queue Info */ 
-	struct hlist_head reqQ;
-	struct hlist_head cmpQ;
+	struct list_head reqQ;
+	struct list_head cmpQ;
 	unsigned int Qdepth;
 	unsigned int maxQsinceinit;
 	unsigned int maxSG;