bootloader: Add fault injection resistance to Secure Boot bootloader verification

Goal is that multiple faults would be required to bypass a boot-time signature check.

- Also strengthens some address range checks for safe app memory addresses
- Change pre-enable logic to also check the bootloader signature before enabling SBV2 on ESP32

Add some additional checks for invalid sections:

- Sections only partially in DRAM or IRAM are invalid
- If a section is in D/IRAM, allow the possibility only some is in D/IRAM
- Only pass sections that are entirely in the same type of RTC memory region

components/bootloader_support/src/esp32/flash_encrypt.c

@@ -366,4 +366,4 @@ esp_err_t esp_flash_encrypt_region(uint32_t src_addr, size_t data_length)
  flash_failed:
     ESP_LOGE(TAG, "flash operation failed: 0x%x", err);
     return err;
-}
+}