net/mlx5: Enable setting minimum inline header mode for VFs

Implement the low-level part of the PF side in setting minimum
inline header mode for VFs.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>