TRNG: Using `ADC` after `TRNG` deinitialization (ESP32-C6)

[playfulFence]

For the sake of finally publishing https://github.com/esp-rs/esp-hal/pull/1538, we have limited the functionality of TRNG on the ESP32C6 chip in the sense that the user cannot downgrade TRNG to RNG and use ADC after that. As soon similar issue is fixed in https://github.com/espressif/esp-idf/issues/14124, I will make the appropriate changes to our TRNG driver and this issue will be closed.