ipa: raspberrypi: Generalise statistics

At present, the controller algorithms access the bcm2835_isp_stats structure,
which is hardware specific. It would be desirable to abstract out the statistics
structure to remove hardware specific headers from the algorithms source files.

Define a new templated RegionStats class that encompasses region based
statistics generated by the ISP. For the VC4 ISP, this can be used to hold
RGB sums and focus FoM values.

Define a new Statistics structure that holds all the VC4 ISP statistics output.
This includes AGC histograms, AGC/AWB region sums and focus FoM regions.

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

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