(kernel-rolling) dt-bindings: ipmi: Add bindings for Phytium KCS

[MingcongBai]

Picked and rebased from #125.

From original pull request:

This patch documents the DT bindings for Phytium KCS interface.

Builds tested

• amd64
• arm64
• loong64

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[deepin-ci-robot]

Hi @MingcongBai. Thanks for your PR.

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[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 代码格式和风格保持一致，没有发现缩进或括号使用不当的问题。
• 属性定义和注释清晰，易于理解。
• 使用了$ref来引用类型定义，提高了代码的可维护性。

是否建议立即修改:

• 否，当前提交的代码质量较高，没有发现需要立即修改的关键问题。