zephyr: add option to disable cryptographic check of the image

- Add Kconfig option `CONFIG_BOOT_SIGNATURE_TYPE_NONE`. When y,
  The bootloader will not verify the cryptographic signature of the image
  at boot or prior to upgrade. Image integrity check is retained.

  Images would still need to be processed using `imgtool` however no key
  should be provided to skip cryptographic signature generation.

Signed-off-by: Arvin Farahmand <arvinf@ip-logix.com>