flash_encryption: Add several test environments for flash encryption test

components/spi_flash/test_apps/flash_encryption/encrypt_flash.sh

@@ -0,0 +1,14 @@
+#This is the step for ESP32-S2/S3/C3
+
+#!/bin/bash
+set -e
+if [ -z "$ESPPORT" ]; then
+    echo "ESPPORT must be set"
+    exit 1
+fi
+dd if=/dev/zero of=key.bin bs=1 count=32
+# Change the first byte as espsecure uses modules that won't
+# allow symmetric keys
+echo -ne \\xFF | dd conv=notrunc bs=1 count=1 of=key.bin
+espefuse.py --do-not-confirm -p $ESPPORT burn_efuse SPI_BOOT_CRYPT_CNT 0x1
+espefuse.py --do-not-confirm -p $ESPPORT burn_key BLOCK_KEY2 key.bin XTS_AES_128_KEY