ipa: rkisp1: awb: Ignore empty AWB statisticsHEADmaster

When the AWB engine doesn't find a valid pixel because all pixels lie
outside the configured colour range it returns an AWB measurement value
of 255, 255, 255. This leaves the regulation in an unrecoverable state
noticeable by a completely green image. Fix that by skipping the AWB
calculation in case there were no valid pixels.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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