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

[MingcongBai]

Picked and rebased from #138.

From original pull request:

This patch documents the DT bindings for Phytium BT interface.

Builds tested

• amd64
• arm64
• loong64

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[deepin-ci-robot]

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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。
• 注释使用中文，有助于理解文档的意图，但建议遵循项目中的注释规范。

是否建议立即修改:

• 否，基于提供的代码片段，没有发现需要立即修改的关键问题。