panfrost: Pass alignments explicitly

panfrost: Pass alignments explicitly

In most cases, GPU data structures need only be self-aligned; the
worst-case 128 byte alignment is wasteful. By passing explicit
alignments, we can reduce memory usage, avoid extra allocations, and
improve descriptor cache locality.

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/6373>