panfrost: Use packs for varying buffers

In addition to better aesthetics, this automatically fixed multiple
instances of accidental CPU readback of GPU buffers -- in a hot path,
too!

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6326>
1 file changed