IB/rdmavt: Add mmap stub

Adds the stub for the mmap verbs call.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c
index e69bc8a..41cfd84 100644
--- a/drivers/infiniband/sw/rdmavt/vt.c
+++ b/drivers/infiniband/sw/rdmavt/vt.c
@@ -251,6 +251,7 @@
 	CHECK_DRIVER_OVERRIDE(rdi, map_phys_fmr);
 	CHECK_DRIVER_OVERRIDE(rdi, unmap_fmr);
 	CHECK_DRIVER_OVERRIDE(rdi, dealloc_fmr);
+	CHECK_DRIVER_OVERRIDE(rdi, mmap);
 
 	/* DMA Operations */
 	rdi->ibdev.dma_ops =