net/mlx5: DR, Add STEv1 modify header logic

Add HW specific modify header fields and logic to STEv1 file.
Since STEv0 and STEv1 modify actions values are different, each
version has its own implementation.

Signed-off-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>