ipa: rpi: contrast: Allow adaptive contrast enhancement to be disabled

The enableCe() function enables or disables adaptive contrast
enhancement and the restoreCe() function sets it back to its normal
state (which is what was read from the tuning file).

In future, algorithms like HDR might want to take over tonemapping
functions, so any dynamic behaviour here would upset them.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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