Apply checker scripts to framework files

[gilles-peskine-arm]

Before we move files to the framework repository, or when we first move a file of a given type to the framework repository, we should adapt checker scripts to check files in the framework repository.

• check_files.py for everything (Extend basic checks and C coding style check to framework files mbedtls#9088)
• code_style.py for C sources (Extend basic checks and C coding style check to framework files mbedtls#9088)
• check_names.py for C sources (to be done when we move tests/include/test/drivers/)
• check-python-files.sh for Python sources (to be done when we move the first python files in Move some scripts to framework submodule mbedtls#8991?)

• more?

[mpg]

Note: as the description says, this is something we should do for each first file we move of a given type / in a given directory.

This issue serves as a reminder to double-check in the end that we haven't forgotten something.