net/mlx5: HWS, added FW commands handling

This patch adds implementation of FW object handling, such
as creation/destruction, modification, and querying.

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

Author: kliteyn