pub fn rtc_calib_version() -> u8 {
        let (_major, minor) = Self::block_version();
        if minor >= 1 { 1 } else { 0 }
    }
Get version of RTC calibration block

see <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c6/esp_efuse_rtc_calib.c#L20>
esp-hal/src/soc/esp32c6/efuse/mod.rs