[bsp][spacemit/k1] first version

[GuEe-GUI]

拉取/合并请求描述：(PR description)

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Part of https://github.com//pull/10320
New BSP for spacemit/k1

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当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
• 已经使用formatting 等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification
• 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查

[github-actions]

👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

---

🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
   点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• Use workflow from 保持默认分支（通常为 master）
  Keep the default branch (usually master) in Use workflow from
• 在 branch 输入框填写 PR 分支 riscv_dm
  Enter PR branch riscv_dm in the branch field
• 设置需排除的文件/目录（目录请以"/"结尾）
  Set files/directories to exclude (directories should end with "/")

3. 等待工作流完成 | Wait for the workflow to complete
   格式化后的代码将作为独立提交推送至你的分支。
   The formatting changes will be pushed to your branch as a separate commit.

完成后，提交将自动更新至 riscv_dm 分支，关联的 Pull Request 也会同步更新。
Once completed, commits will be pushed to the riscv_dm branch automatically, and the related Pull Request will be updated.

如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

[Copilot]

Pull request overview

This PR introduces the first version of a new Board Support Package (BSP) for the Spacemit K1 platform to RT-Thread. The changes add comprehensive driver support across multiple hardware subsystems including SPI, GPIO, power management, reset control, and various peripheral devices.

Changes:

• New BSP infrastructure for Spacemit K1 platform
• Driver implementations for SPI/QSPI, GPIO, thermal, serial, RTC, reset controller, regulators, PWM, power management, pinctrl, mailbox, and input devices
• Multi-Function Device (MFD) support for Spacemit PMIC
• SoC-specific support including remote processor, TCM memory, and SoC information

Reviewed changes

Copilot reviewed 96 out of 162 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
bsp/spacemit/dm/thermal/*	Thermal management driver for K1X
bsp/spacemit/dm/spi/*	SPI and QSPI controller drivers
bsp/spacemit/dm/soc/*	SoC info, IPI, TCM, and remote processor support
bsp/spacemit/dm/serial/*	PXA UART driver with DMA support
bsp/spacemit/dm/rtc/*	Spacemit PMIC RTC driver
bsp/spacemit/dm/reset/*	K1X reset controller driver
bsp/spacemit/dm/regulator/*	PMIC power regulator driver
bsp/spacemit/dm/pwm/*	PXA PWM driver
bsp/spacemit/dm/power/*	Reboot mode handler
bsp/spacemit/dm/pmdomain/*	Power domain controller
bsp/spacemit/dm/pinctrl/*	PMIC pinctrl driver
bsp/spacemit/dm/pin/*	K1X GPIO driver
bsp/spacemit/dm/mfd/*	Spacemit PMIC MFD driver
bsp/spacemit/dm/mailbox/*	K1X mailbox driver
bsp/spacemit/dm/input/*	PMIC power key input driver
bsp/spacemit/dm/include/*	TCM memory allocation header