ipmi: Add Phytium KCS IPMI BMC driver support

[lyt31]

This driver exposes the KCS interface on Phytium SOCs as a
character device. Such SOCs are commonly used as BMCs and this driver
implements the BMC side of the KCS interface.

[deepin-ci-robot]

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[deepin-ci-robot]

Hi @lyt31. Thanks for your PR.

I'm waiting for a deepin-community member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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