utils: checkstyle.py: Add d-pointer formatter

Add a formatter to ensure consistent naming of 'd' and 'o' variables
related to the d-pointer design pattern, as implemented by the
Extensible class. The formatter also ensures that the pointer is always
const. const-correctness issues related to the data pointed to will be
caught by the compiler, and thus don't need to be checked here.

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

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