net/mlx5e: Optimize performance for IPv4/IPv6 ethertype

The HW is optimized for IPv4/IPv6. For such cases, pending capability,
avoid matching on ethertype, and use ip_version field instead.

Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>