ipa: rkisp1: awb: Take the CCM into account for the AWB gains calculation

The AWB measurements are taken after the CCM. This can be seen by
enabling debug logging on AWB, disabling AWB (stats will still be
processed) and manually chaning the CCM.

This means that the estimated colour temperature and the corresponding
CCM also lead to changed rgbMeans which in turn leads to oscillations.
Fix that by applying the inverse transform on the rgbMeans.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

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