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

Author: kliteyn