bsp: cvitek: fix source command spelling in Kconfig

[KennethLiu61]

[Problem Description]
The Kconfig file contained misspelled source commands:

• "osource" instead of "source" for packages config inclusion
• "rsource" instead of "source" for board config inclusion

[Root Cause]
Incorrect source command spelling breaks Kconfig processing:

1. "osource" is not a valid Kconfig command
2. "rsource" is not a valid Kconfig command
3. These typos prevent proper configuration inheritance

[Solution]
Correct the source command spellings:

• Change "osource" to standard "source" for packages
• Change "rsource" to standard "source" for board
• Maintain original configuration hierarchy

拉取/合并请求描述：(PR description)

[

为什么提交这份PR (why to submit this PR)

你的解决方案是什么 (what is your solution)

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

• BSP:

• .config:

• action:

]

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/workflows/bsp_buildings.yml 详细请参考链接BSP自查

[unicornx]

osourc 和 rsource 也是合法的命令吧，见 https://pypi.org/project/kconfiglib/#library-documentation

我觉得原来的写法没有问题呢。

[unicornx]

如果没有问题请 close 这个 PR