libcamera: pipeline: uvcvideo: Create UVCCameraData

Subclassing CameraData will become mandatory for pipeline handlers.
Create a new UVCCameraData class and instantiate it when creating
cameras to prepare for that change. The video_ and stream_ fields of the
UVC pipeline handler belong to the camera data, move them there.

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

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