Method update

devices/src/legacy/serial.rs:361–369

(
            &self,
            _index: InterruptIndex,
            _config: InterruptSourceConfig,
            _masked: bool,
            _set_gsi: bool,
        )

            self.event_fd.write(1)
        }
        fn update(
            &self,
            _index: InterruptIndex,
            _config: InterruptSourceConfig,
            _masked: bool,
            _set_gsi: bool,
        ) -> result::Result<(), std::io::Error> {
            Ok(())
        }
        fn set_gsi(&self) -> result::Result<(), std::io::Error> {
            Ok(())
        }