pub fn rtc_calib_version() -> u8 {
        let (_major, minor) = Self::block_version();
        if minor >= 2 { 1 } else { 0 }
    }
Get version of RTC calibration block

See: <https://github.com/espressif/esp-idf/blob/be06a6f/components/efuse/esp32h2/esp_efuse_rtc_calib.c#L20>
//esp_efuse_rtc_calib_get_ver
esp-hal/src/soc/esp32h2/efuse/mod.rs