format-code: simplify exclusion filter for clang

The clang-format linter calls have a custom ignore list. Write
a python script for reusable git-ignore-like filtering and switch
the clang-format li

format-code: simplify exclusion filter for clang

The clang-format linter calls have a custom ignore list. Write
a python script for reusable git-ignore-like filtering and switch
the clang-format linter call to use it.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I788c0e3de55fae592318a997b676c73a7f13e74c

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