(kernel-rolling) ipmi: Add Phytium KCS IPMI BMC driver support

[MingcongBai]

Picked and rebased from #134. May have dependency on #177.

From original pull request:

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.

Builds tested

• amd64
• arm64
• loong64

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