net/mlx5: Fix ingress/egress naming mistake

The functions names do not represent their actions, switch the mistaken
ingress/egress naming.

Fixes: fba53f7b

 ("net/mlx5: Introduce mlx5_flow_steering structure")
Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>