sign: rimage: Include uuid-registry.h header in toml preprocessing

Add a function generate_uuid_registry that calls the gen-uuid-reg.py script
to generate the uuid-registry.h file. If signing an image without sof,
trigger the generation of the uuid-registry.h file.

Instruct the toml file preprocessor to also use the definitions from the
uuid-registry.h file. This will allow the values ​​placed in the
uuid-registry to be used in toml files.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>