utils: checkstyle: Run the CLangFormatter last

The IncludeOrderFormatter will be extended with more formatting rules
that should be applied before clang-format gets run, as it will
influence its output.

Add a priority mechanism for formatters, and give a negative priority to
the CLangFormatter to make it run last.

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

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