net/mlx5e: Use modify header ID cache for offloaded TC NIC flows

Use the modify header ID cache for the header re-write part of offloading
TC NIC flows.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>