RDMA/mlx5: Don't create IB representors when in multiport RoCE mode

Switchdev mode and mutiport RoCE mode aren't compatible at this point.
Don't create IB reps when a user switches to switchdev mode and the driver
operates in that mode.
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

@@ -6630,6 +6630,7 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
 
 	if (MLX5_ESWITCH_MANAGER(mdev) &&
 	    mlx5_ib_eswitch_mode(mdev->priv.eswitch) == SRIOV_OFFLOADS) {
+		if (!mlx5_core_mp_enabled(mdev))
 			mlx5_ib_register_vport_reps(mdev);
 		return mdev;
 	}