create_st_fip_binary.sh converts binary encryption keys to hex before
passing them to encrypt_fw. hexdump may collapse repeated binary data
into '*', corrupting the key and causing encrypt_fw to reject it with an
invalid key size.
Add a bbappend to patch the helper from meta-digi and use hexdump -v so
the full key is emitted.
https://onedigi.atlassian.net/browse/DEL-10115
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Javier Viguera