efuse: Fix load_efuses_from_flash when FE is on

esp_efuse_utility_load_efuses_from_flash() read emul_efuse
as an encrypted partition, but that is not correct,
this partition was never encrypted.
Need to read it as not encrypted partition.

Fxed the case: If FE is already on then EFUSE VIRT mode can work with it.

Closes espressif/esp-idf#10929

components/efuse/src/esp_efuse_utility.c

@@ -467,7 +467,7 @@ bool esp_efuse_utility_load_efuses_from_flash(void)
     }
     uint32_t efuses_in_flash[sizeof(virt_blocks)];
 
-    esp_err_t err = bootloader_flash_read(esp_efuse_flash_offset, &efuses_in_flash, sizeof(efuses_in_flash), true);
+    esp_err_t err = bootloader_flash_read(esp_efuse_flash_offset, &efuses_in_flash, sizeof(efuses_in_flash), false);
     if (err != ESP_OK) {
         ESP_EARLY_LOGE(TAG, "[Virtual] Can not read eFuse partition from flash (err=0x%x)", err);
         abort();

components/hal/efuse_hal.c

@@ -23,3 +23,16 @@ IRAM_ATTR uint32_t efuse_hal_chip_revision(void)
 {
     return efuse_hal_get_major_chip_version() * 100 + efuse_hal_get_minor_chip_version();
 }
+
+IRAM_ATTR bool efuse_hal_flash_encryption_enabled(void)
+{
+    uint32_t flash_crypt_cnt = efuse_ll_get_flash_crypt_cnt();
+    bool enabled = false;
+    while (flash_crypt_cnt) {
+        if (flash_crypt_cnt & 1) {
+            enabled = !enabled;
+        }
+        flash_crypt_cnt >>= 1;
+    }
+    return enabled;
+}

components/hal/include/hal/efuse_hal.h

@@ -26,6 +26,15 @@ void efuse_hal_get_mac(uint8_t *mac);
  */
 uint32_t efuse_hal_chip_revision(void);
 
+/**
+ * @brief Is flash encryption currently enabled in hardware?
+ *
+ * Flash encryption is enabled if the FLASH_CRYPT_CNT efuse has an odd number of bits set.
+ *
+ * @return true if flash encryption is enabled.
+ */
+bool efuse_hal_flash_encryption_enabled(void);
+
 /**
  * @brief Returns major chip version
  */