ESP32: RTC domain must be initialized on boot

[MabezDev]

I didn't label this as a bug yet, but if crate::rtc_cntl::Rtc::new(&mut peripherals.LPWR); is not called on boot on the esp32, many things get broken, namely wifi. Given that we always do this, it's not a problem yet but if we ever resolve https://github.com/esp-rs/esp-hal/issues/1698 it will be.

context: https://github.com/esp-rs/esp-hal/pull/2104