[bsp/xuantie] 添加bsp导入rt-studio相关文件

[MuChenger]

拉取/合并请求描述：(PR description)

[

为什么提交这份PR (why to submit this PR)

• xuantie系列bsp可以以bsp导入rt-studio进行开发

你的解决方案是什么 (what is your solution)

• 添加rt-studio工程需要的cdt文件

请提供验证的bsp和config (provide the config and bsp)

• BSP:e902,e906,e907,c906.c907,c908,c910,r908,r910,r920

]

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

[Copilot]

Pull Request Overview

This PR adds RT-Thread Studio project support for the xuantie BSP series by adding the necessary configuration files for Eclipse CDT integration. This enables developers to import these BSPs directly into RT-Studio for development.

• Adds RT-Studio project configuration files (.project, .settings, projcfg.ini)
• Updates Kconfig files to use proper environment variable syntax for RT-Studio compatibility
• Adds pre-include header files (rtconfig_preinc.h) with platform-specific macro definitions

Reviewed Changes

Copilot reviewed 51 out of 60 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Multiple rtconfig_preinc.h files	Auto-generated header files with platform-specific macro definitions for RT-Thread configuration
Multiple Kconfig files	Updated configuration syntax from assignment to proper Kconfig format for RT-Studio compatibility
Multiple .project files	Eclipse CDT project configuration files for RT-Studio integration
Multiple .settings/*.ini and .prefs files	RT-Studio specific project settings and preferences
bsp/xuantie/xiaohui/r910/rtconfig.py	Updated path reference for tools directory
bsp/xuantie/xiaohui/c908/rtconfig.py	Removed Chinese comment

[Copilot]

Bug/错误: Missing 'C' prefix in macro name. Should be 'CONFIG_CPU_XUANTIE_C906FD' not 'DCONFIG_CPU_XUANTIE_C906FD'.

中文：宏定义名称缺少'C'前缀。应该是'CONFIG_CPU_XUANTIE_C906FD'而不是'DCONFIG_CPU_XUANTIE_C906FD'。

Suggested change

	#define DCONFIG_CPU_XUANTIE_C906FD 1
	#define CONFIG_CPU_XUANTIE_C906FD 1

[Copilot]

Bug/错误: Incorrect path construction. Using '../tools' with dirname(BSP_ROOT) creates an invalid path. Should be 'tools' instead of '../tools'.

中文：路径构造错误。在dirname(BSP_ROOT)基础上使用'../tools'会创建无效路径。应该使用'tools'而不是'../tools'。

Suggested change

	sys.path.append(os.path.join(os.path.dirname(BSP_ROOT), '../tools'))
	sys.path.append(os.path.join(os.path.dirname(BSP_ROOT), 'tools'))

[Rbb666]

@MuChenger 这个文件不用提交上来，这个是studio自动生成的

[kurisaW]

rtconfig_preinc.h文件如果想要bsp导入studio后直接编译的话，其实还是需要保留的，否则用户就必须先执行一遍scons同步生成rtconfig_preinc.h，看从用户使用便利性的角度要不要保留吧（有些用户并不懂为什么会有个libc的报错是因为要先执行scons同步后生成宏定义）

[supperthomas]

后续可以论坛或者文档中心中，加一些文档如何使用。或者doc中加一些说明如何使用。