The EDID code is copy from elsewhere, without adapting to conventions
regarding e.g. API and types. Clean this up a bit, as EDID information
will be kept around longer when possible, to be used e.g. by color
management.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2351>
The order and way include macros were structured was chaotic, with no
real common thread between files. Try to tidy up the mess with some
common scheme, to make things look less messy.