radv/radix_sort: Vendor the radix sort dispatch code

radv/radix_sort: Vendor the radix sort dispatch code

This needs to be done so we can optimize it for occpuancy when building
multiple acceleration structures in parallel. Changes to the original
code:

- Change // to /* */
- clang-format
- Replace vkCmd calls with calls to the driver entrypoints
- Add a light weight info struct
- Use radv_fill_buffer directly

Reviewed-by: Friedrich Vock <friedrich.vock@gmx.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24720>