libcamera: controls: Index ControlList by unsigned int

In preparation for serialization, index the ControlList by unsigned int.
This will allow deserializing a ControlList without requiring external
information.

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

src/libcamera/include/camera_controls.h

@@ -19,7 +19,7 @@ public:
 	CameraControlValidator(Camera *camera);
 
 	const std::string &name() const override;
-	bool validate(const ControlId &id) const override;
+	bool validate(unsigned int id) const override;
 
 private:
 	Camera *camera_;