Remove calls to freertos C APIs

https://github.com/esp-rs/espressif-trainings/blob/62192ea5c1de506df3960ff256db167cf3bcc945/advanced/button-interrupt/examples/solution.rs#L18 can now be replaced with [`SubscribedPin`](https://github.com/esp-rs/esp-idf-hal/blob/72c0aacf74313a479acc3dfef5d814c1e7319f7e/src/gpio.rs#L964) from esp-idf-hal.