Rename argon.c to argon_wrapper.c so we can use 'argon' as the library
name. Move the include file into the normal place.
Add SPDX tags but otherwise keep the files as is. The code style uses
spaces instead of tabs and has other differences with U-Boot
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>