libcamera: camera_sensor: Expose the camera device

Expose the device backing the CameraSensor instance.

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

src/libcamera/camera_sensor.cpp

@@ -641,6 +641,13 @@ int CameraSensor::setControls(ControlList *ctrls)
 	return subdev_->setControls(ctrls);
 }
 
+/**
+ * \fn CameraSensor::device()
+ * \brief Retrieve the camera sensor device
+ * \todo Remove this function by integrating DelayedControl with CameraSensor
+ * \return The camera sensor device
+ */
+
 /**
  * \fn CameraSensor::properties()
  * \brief Retrieve the camera sensor properties