net/mlx5e: Print netdev features correctly in error message

Use the correct formatting for netdev features.

Fixes: 0e405443 ("net/mlx5e: Improve set features ndo resiliency")
Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>