ipa: raspberrypi: alsc: Replace std::vectors by Array2D class

The Array2D class is a very thin wrapper round std::vector that can be
used almost identically in the code, but it carries its 2D size with
it so that we aren't passing it around all the time.

All the std::vectors that were X * Y in size (X and Y being the ALSC
grid size) have been replaced. The sparse matrices that are XY * 4 in
size have not been as they are somewhat different, are used
differently, require more code changes, and actually make things more
confusing if everything looks like an Array2D but are not the same.

There should be no change in algorithm behaviour at all.

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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