net/mlx5: HWS, added definers handling

The Match Definer combines packet fields and a mask,
creating a key which can be used for packet matching
during steering flow processing.
This patch adds handling of definer objects in HWS.

Reviewed-by: Hamdan Agbariya <[email protected]>
Signed-off-by: Yevgeny Kliteynik <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: kliteyn