net/hinic/base: add API command channel

API command channel is for communicating with mgmt module of chip.
This patch introduces data structures, initialization, interfaces,
and commands sending fun

net/hinic/base: add API command channel

API command channel is for communicating with mgmt module of chip.
This patch introduces data structures, initialization, interfaces,
and commands sending functions of API command channel.

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

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