[BUG] check_compliance.py needs support for Bridle's downstream modules folder

[rexut]

Describe the bug

Traceback (most recent call last):
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 2190, in _enter_file
    self._readline = self._open(filename, "r").readline
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3959, in _open
    open(filename, mode, encoding=self._encoding)
IsADirectoryError: [Errno 21] Is a directory: '.../workspace/zephyr/'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./scripts/ci/check_compliance.py", line 1267, in main
    n_fails = _main(args)
  File "./scripts/ci/check_compliance.py", line 1202, in _main
    test.run()
  File "./scripts/ci/check_compliance.py", line 682, in run
    super().run(full=False)
  File "./scripts/ci/check_compliance.py", line 270, in run
    kconf = self.parse_kconfig()
  File "./scripts/ci/check_compliance.py", line 384, in parse_kconfig
    return kconfiglib.Kconfig()
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 947, in __init__
    self._init(filename, warn, warn_to_stderr, encoding)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 1085, in _init
    self._parse_block(None, self.top_node, self.top_node).next = None
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3001, in _parse_block
    prev = self._parse_block(None, parent, prev)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3040, in _parse_block
    self._parse_block(_T_ENDMENU, node, node)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3001, in _parse_block
    prev = self._parse_block(None, parent, prev)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3001, in _parse_block
    prev = self._parse_block(None, parent, prev)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3040, in _parse_block
    self._parse_block(_T_ENDMENU, node, node)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 3000, in _parse_block
    self._enter_file(filename)
  File ".../workspace/zephyr/scripts/kconfig/kconfiglib.py", line 2193, in _enter_file
    raise _KconfigIOError(
kconfiglib._KconfigIOError: /tmp/Kconfig.modules:206: Could not open '.../workspace/zephyr/' (in 'osource "$(ZEPHYR_UBXLIB_KCONFIG)"') (EISDIR: Is a directory)

To Reproduce
Steps to reproduce the behavior: See https://github.com/tiacsys/bridle/actions/runs/6926377539/job/18838445069?pr=158

Expected behavior
./scripts/ci/check_compliance.py --annotate -m KconfigBasic -c origin/v3.6-branch.. works w/o side effects also for downstrem modules folder.

Impact
No showstopper for the time being, but should be fixed until next Bridle release.

Logs and console output

See: https://github.com/tiacsys/bridle/actions/runs/6926377539/job/18838445069?pr=158

Screenshots

Non.

Development Environment (please complete the following information):

• OS: Linux
• Toolchain: Zephyr SDK v0.16.5
• Commit 59aa31a6b0742175c5fa1293ad2ad792b45dd9da, Version 3.6.0-rc1, Branch v3.6-next

Additional context

Non.

[github-actions]

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