net/hinic/base: add mgmt module

Mgmt module is a kind of administration module for the chip.
It is responsible for handling administration command from host.
It uses api channel. This patch adds related data structures,
packaged interfaces and function codes.

Signed-off-by: Ziyang Xuan <xuanziyang2@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>