radeonsi: use the same nir_lower_subgroups_options as RADV

Some FREE calls are removed because nir_options is always NULL there.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28725>
6 files changed