fix(bootloader_support): Add missing c linkage to some headers

Merges https://github.com/espressif/esp-idf/pull/13890

components/bootloader_support/private_include/bootloader_utility.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -9,6 +9,11 @@
 #include "esp_image_format.h"
 #include "bootloader_config.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 /**
  * @brief Load partition table.
  *
@@ -16,7 +21,7 @@
  * OTA data partition, factory app partition, and test app partition.
  *
  * @param[out] bs Bootloader state structure used to save read data.
- * @return        Return true if the partition table was succesfully loaded and MD5 checksum is valid.
+ * @return        Return true if the partition table was successfully loaded and MD5 checksum is valid.
  */
 bool bootloader_utility_load_partition_table(bootloader_state_t* bs);
 
@@ -120,3 +125,7 @@ void bootloader_debug_buffer(const void *buffer, size_t length, const char *labe
  * @return ESP_OK if secure boot digest is generated successfully.
  */
 esp_err_t bootloader_sha256_flash_contents(uint32_t flash_offset, uint32_t len, uint8_t *digest);
+
+#ifdef __cplusplus
+}
+#endif