libcamera: ipu3: Create ImgUDevice class

Group ImgU components in a class associated with a camera at camera
registration time and provide an intialization method to create and open
all video devices and subdevices of the ImgU.

Statically assign imgu0 to the first camera and imgu1 to the second one
and limit support to two cameras. This will have to be revised in the
future.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

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