net/mlx5e: kTLS, Fix tisn field placement

Shift the tisn field in the WQE control segment, per the
HW specification.

Fixes: d2ead1f3

 ("net/mlx5e: Add kTLS TX HW offload support")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>