Documentation: guides: pipeline-handler: Update code, commands and logs

The pipeline-handler guide is a bit outdated:
- ControlList* in start() is now const.
- Registered pipeline handler log now comes from Camera log and the message is different.

Update the pipeline-handler guide to reflect these changes.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Sebastian Fricke <sebastian.fricke@posteo.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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