intel: fix gen_sort_tags.py

intel: fix gen_sort_tags.py

The script was failing for me (python 3.8), not sure if this is a recent
python version break or not as I don't know how often people have been
running this script:

    Processing ./gen9.xml... Traceback (most recent call last):
      File "./gen_sort_tags.py", line 177, in <module>
        main()
      File "./gen_sort_tags.py", line 170, in main
        genxml[:] = enums + sorted_structs.values() + instructions + registers
    TypeError: can only concatenate list (not "odict_values") to list

Turning the odict into a list fixes it for me, and the resulting xml
file are identical to before :)

Fixes: 903e142f0d35bc550ffd ("genxml: add a sorting script")
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5352>