This introduces ac_sampler_state which contains all information to
build a sampler descriptor for AMD hardware instead of duplicating
code between RADV and RadeonSI. Both drivers just need to fill this
new struct to get a descriptor.
This allows RADV to get GFX12 support for free. I think we should
introduce helpers for other type of descriptors.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29221>
