panfrost: Raise TEXTURE_BUFFER_OFFSET_ALIGNMENT

panfrost: Raise TEXTURE_BUFFER_OFFSET_ALIGNMENT

The blob advertises 64 for this, so let's use the same value. Small
alignments are observed to raise an IMPRECISE_FAULT at least on Bifrost.
As a bonus this forces cache line alignment which will help perf. Fixes

dEQP-GLES31.functional.texture.texture_buffer.render.as_vertex_texture.offset_1_alignments

Fixes: 5f7bafa316f ("panfrost: Enable ARB_texture_buffer_object")
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9164>