utils: raspberrypi: ctt: Add alsc_only method

The ctt would not work if only passed alsc images.

Add alsc_only.py to run alsc calibration only, and modify check_imgs
to allow for no macbeth chart images.

Example usage would be ./alsc_only.py -i tuning-images/ -o sensor.json
with the same optional arguments as the original ctt.

Signed-off-by: William Vinnicombe <william.vinnicombe@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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