ipa: Add a common interface for algorithm objects

In order to instantiate and use algorithms (AWB, AGC, etc.)
there is a need for a common class to define mandatory methods.

Instead of reinventing the wheel, reuse what Raspberry Pi has done and
adapt to the minimum requirements expected.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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