secure_boot: Checks secure boot efuses

ESP32 V1 and V2 - protection bits.
ESP32xx V2: revoke bits, protection bits

- refactor efuse component
- adds some APIs for esp32 chips as well as for esp32xx chips

components/efuse/esp32c3/include/esp_efuse_rtc_calib.h

@@ -0,0 +1,53 @@
+// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at",
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License
+
+#include <esp_types.h>
+#include <esp_err.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Get the RTC calibration efuse version
+ *
+ * @return Version of the stored efuse
+ */
+int esp_efuse_rtc_calib_get_ver(void);
+
+/**
+ * @brief Get the init code in the efuse, for the corresponding attenuation.
+ *
+ * @param version Version of the stored efuse
+ * @param atten  Attenuation of the init code
+ * @return The init code stored in efuse
+ */
+uint16_t esp_efuse_rtc_calib_get_init_code(int version, int atten);
+
+/**
+ * @brief Get the calibration digits stored in the efuse, and the corresponding voltage.
+ *
+ * @param version Version of the stored efuse
+ * @param atten         Attenuation to use
+ * @param out_digi      Output buffer of the digits
+ * @param out_vol_mv    Output of the voltage, in mV
+ * @return
+ *      - ESP_ERR_INVALID_ARG: If efuse version or attenuation is invalid
+ *      - ESP_OK: if success
+ */
+esp_err_t esp_efuse_rtc_calib_get_cal_voltage(int version, int atten, uint32_t* out_digi, uint32_t* out_vol_mv);
+
+#ifdef __cplusplus
+}
+#endif