net/mlx5e: Support setup of tos and ttl for tunnel key TC action offload

Use the values provided by user-space for the encapsulation headers.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>