RDMA/cxgb3: Fix MR permission problems

Fix memory region permission problems:

- remove useless and redundant iwch_mem_perms enum.

- create ib_to_tpt_access_rights() for mapping ib access rights
  to T3 TPT permissions.

- create ib_to_mwbind_access_rights() for mapping ib access rights
  to T3 MWBIND WR permissions.

- fix up the mem reg code to utilize the new functions.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/cxgb3/iwch_qp.c

@@ -439,7 +439,7 @@ int iwch_bind_mw(struct ib_qp *qp,
 	wqe->bind.type = T3_VA_BASED_TO;
 
 	/* TBD: check perms */
-	wqe->bind.perms = iwch_convert_access(mw_bind->mw_access_flags);
+	wqe->bind.perms = iwch_ib_to_mwbind_access(mw_bind->mw_access_flags);
 	wqe->bind.mr_stag = cpu_to_be32(mw_bind->mr->lkey);
 	wqe->bind.mw_stag = cpu_to_be32(mw->rkey);
 	wqe->bind.mw_len = cpu_to_be32(mw_bind->length);