utils: checkstyle.py: Add Doxygen formatter

Add a formatter for doxygen comments. In its initial implementation the
formatter ensures that the first word of a \return statement starts with
an uppercase letter.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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