net/mlx5: Make mlx5_esw_offloads_rep_load/unload() static

mlx5_esw_offloads_rep_load/unload() functions are not used
outside of eswitch_offloads.c. Make them static.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>