net/mlx5: fix multiple definitions of mlx5_lag_mpesw_init / mlx5_lag_mpesw_cleanup

static inline is needed in the header.

Fixes: 94db3317 ("net/mlx5: Support multiport eswitch mode")
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20220518183022.2034373-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.h

@@ -19,8 +19,8 @@ bool mlx5_lag_mpesw_is_activated(struct mlx5_core_dev *dev);
 void mlx5_lag_mpesw_init(struct mlx5_lag *ldev);
 void mlx5_lag_mpesw_cleanup(struct mlx5_lag *ldev);
 #else
-void mlx5_lag_mpesw_init(struct mlx5_lag *ldev) {}
-void mlx5_lag_mpesw_cleanup(struct mlx5_lag *ldev) {}
+static inline void mlx5_lag_mpesw_init(struct mlx5_lag *ldev) {}
+static inline void mlx5_lag_mpesw_cleanup(struct mlx5_lag *ldev) {}
 #endif
 
 #endif /* __MLX5_LAG_MPESW_H__ */