utils: checkstyle.py: Don't run commit title checker on staged commits

When creating a new commit, there is no title, so the title checker
complains that the title isn't compliant and the commit cannot be
created if checkstyle is run as a pre-commit hook. Fix this by skipping
the title checker when run on staged changes.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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