bsp/simulator: fix issues for Visual Studio project generator

[MouriNaruto]

拉取/合并请求描述：(PR description)

I find some issues like the following output mentioned when I use bsp/simulator's Visual Studio project generator:

(RTThreadPython) D:\Projects\MobilityOS\rt-thread\bsp\simulator>scons --target=vs2012 -s
Successfully installed VC 14.3, path:C:\Program Files\Microsoft Visual Studio\2022\Community\VC
Successfully installed VC 14.3, path:C:\Program Files\Microsoft Visual Studio\2022\Community\VC
AttributeError: module 'rtconfig' has no attribute 'DEVICE':
  File "D:\Projects\MobilityOS\rt-thread\bsp\simulator\SConstruct", line 81:
    objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=False)
  File "D:\Projects\MobilityOS\rt-thread\tools\building.py", line 407:
    objs.extend(SConscript(Rtt_Root + '/components/SConscript',
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 687:
    return method(*args, **kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 623:
    return _SConscript(self.fs, *files, **subst_kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 281:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "D:\Projects\MobilityOS\rt-thread\components\SConscript", line 15:
    objs = objs + SConscript(os.path.join(item, 'SConscript'))
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 687:
    return method(*args, **kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 623:
    return _SConscript(self.fs, *files, **subst_kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 281:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "D:\Projects\MobilityOS\rt-thread\components\libc\SConscript", line 14:
    objs = objs + SConscript(os.path.join(d, 'SConscript'))
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 687:
    return method(*args, **kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 623:
    return _SConscript(self.fs, *files, **subst_kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 281:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "D:\Projects\MobilityOS\rt-thread\components\libc\compilers\SConscript", line 13:
    objs = objs + SConscript(os.path.join(d, 'SConscript'))
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 687:
    return method(*args, **kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 623:
    return _SConscript(self.fs, *files, **subst_kw)
  File "D:\Projects\MobilityOS\RTThreadPython\Lib\site-packages\SCons\Script\SConscript.py", line 281:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "D:\Projects\MobilityOS\rt-thread\components\libc\compilers\newlib\SConscript", line 8:
    newlib_version = GetNewLibVersion(rtconfig)
  File "D:\Projects\MobilityOS\rt-thread\tools\gcc.py", line 170:
    fn = GetHeader(rtconfig, 'picolibc.h')
  File "D:\Projects\MobilityOS\rt-thread\tools\gcc.py", line 105:
    include_dirs = GetGccDefaultSearchDirs(rtconfig)
  File "D:\Projects\MobilityOS\rt-thread\tools\gcc.py", line 74:
    device_flags = rtconfig.DEVICE.split()

(RTThreadPython) D:\Projects\MobilityOS\rt-thread\bsp\simulator>

I do a simple fix to make the generator happy.

Kenji Mouri

当前拉取/合并请求的状态 Intent for your PR

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• 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

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