ipa: rpi: alsc: Do not allow zero colour ratio statistics

The algorithm computes R/G and B/G colour ratio statistics which we
should not allow to go to zero because there is clearly no gain you
could apply to R or B to equalise them. Instead flag such regions as
having "insufficient data" in the normal manner.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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