libcamera: camera_sensor: Introduce CameraSensorFactory

Introduce a factory to create CameraSensor derived classes instances by
inspecting the sensor media entity name and provide a convenience macro
to register specialized sensor handlers.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -1232,10 +1232,9 @@ int PipelineHandlerRkISP1::createCamera(MediaEntity *sensor)
 		std::make_unique<RkISP1CameraData>(this, &mainPath_,
 						   hasSelfPath_ ? &selfPath_ : nullptr);
 
-	data->sensor_ = std::make_unique<CameraSensor>(sensor);
-	ret = data->sensor_->init();
-	if (ret)
-		return ret;
+	data->sensor_ = CameraSensorFactoryBase::create(sensor);
+	if (!data->sensor_)
+		return -ENODEV;
 
 	/* Initialize the camera properties. */
 	data->properties_ = data->sensor_->properties();