IB/core: Use rdma_ah_attr accessor functions

Modify core and driver components to use accessor functions
introduced to access individual fields of rdma_ah_attr

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/verbs.h

@@ -347,7 +347,7 @@ int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct ib_header *hdr,
 		       int has_grh, struct rvt_qp *qp, u32 bth0);
 
 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
-		  struct ib_global_route *grh, u32 hwords, u32 nwords);
+		  const struct ib_global_route *grh, u32 hwords, u32 nwords);
 
 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
 			  u32 bth0, u32 bth2, int middle,