Documentation: Explicitly enable Dot

The dot package is identified as a required package for the Documentation, and
already marked as a required dependency with meson.

If meson can not find 'dot', then the documentation will not be built,
so we can explicitly enable it in our Doxyfile.

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

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