utils: checkstyle.py: Use r'' strings for regular expressions

It's a good practice to use r'' strings for regular expressions in
Python, to avoid unexpected interaction with string escape sequences.
Use them globally. This allows simplifying escaping in one of the
regular expression strings.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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