libipa: camera_sensor_helper: Mark createInstance() with override

The CameraSensorHelperFactory::createInstance() function overrides a
virtual function from CameraSensorHelperFactoryBase. The function
declaration doesn't mark it with the override keyword. This could cause
issues in the future if the base class' function changes, as the
compiler will not issue any warning in that case. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/libipa/camera_sensor_helper.h

@@ -88,7 +88,7 @@ public:
 	}
 
 private:
-	std::unique_ptr<CameraSensorHelper> createInstance() const
+	std::unique_ptr<CameraSensorHelper> createInstance() const override
 	{
 		return std::make_unique<_Helper>();
 	}