ipa: raspberrypi: Use CamHelpers to generalise sensor embedded data parsing

CamHelpers get virtual Prepare() and Process() methods, running just
before and just after the ISP, just like Raspberry Pi Algorithms.

The Prepare() method is able to parse the register dumps in embedded
data buffers, and can be specialised to perform custom processing when
necessary.

The IPA itself only needs to call the new Prepare() and Process()
methods. It must fill in the DeviceStatus from the controls first, in
case the Prepare() method does not supply its own values.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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