This lets us move a bunch of stuff out of codegen and back into
anv_device.c which is a bit nicer.
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
The new anv_extensions_gen.py is the code generator while the old
anv_extensions.py file is purely declarative.
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>