panfrost: Choose AFBC when available

There are lots of reasons we might fallback on u-interleaved tiling, but
when we can use AFBC, it's a big win.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Icecream95 <ixn@keemail.me>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6159>