rimage: ipc4 module config cleanup

[aiChaoSONG]

• align module_type used in mtl.toml/tgl-cavs.toml/tgl-h-cavs.toml to comply with mod_type enum: https://github.com/thesofproject/rimage/blob/bdf48ee7e63779a804f709634e68d274090f510d/src/include/rimage/cavs/cavs_ext_manifest.h#LL194-L217C4
• load_type is used to indicate built-in module (0) or loadable (1), we don't have loadable module yet, so it should be zero for all modules.