net/mlx5: Change the name of steering mode param id

The prefix should be "MLX5_DEVLINK_PARAM_ID_" for all in
mlx5_devlink_param_id enum.

Signed-off-by: Jianbo Liu <jianbol@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>