IB/qib: Remove dma.c and use rdmavt version of dma functions

This patch removes the qib_dma.c file and uses the version which has been
added to rdmavt.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index f8975ea..ae3c661 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -41,6 +41,7 @@
 #include <linux/mm.h>
 #include <linux/random.h>
 #include <linux/vmalloc.h>
+#include <rdma/rdma_vt.h>
 
 #include "qib.h"
 #include "qib_common.h"
@@ -2273,7 +2274,7 @@
 	ibdev->detach_mcast = qib_multicast_detach;
 	ibdev->process_mad = qib_process_mad;
 	ibdev->mmap = qib_mmap;
-	ibdev->dma_ops = &qib_dma_mapping_ops;
+	ibdev->dma_ops = NULL;
 	ibdev->get_port_immutable = qib_port_immutable;
 
 	snprintf(ibdev->node_desc, sizeof(ibdev->node_desc),