bootloader_support: Adds better logs for virtual efuses

Close https://github.com/espressif/esp-idf/pull/10383

components/bootloader_support/src/flash_encryption/flash_encrypt.c

@@ -313,6 +313,10 @@ esp_err_t esp_flash_encrypt_enable(void)
 
     ESP_LOGI(TAG, "Flash encryption completed");
 
+#if CONFIG_EFUSE_VIRTUAL
+    ESP_LOGW(TAG, "Flash encryption not really completed. Must disable virtual efuses");
+#endif
+
     return err;
 }