checkstyle: Add a pre-commit hook script

This adds support for pre-commit hook workflow. In pre-commit hook we
check the style on the changes currently staged or the combination
of the index and the last commit if "git commit --amend" is being used.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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