pan/decode: Restore bifrost sample_locations

Code by Connor Abbott, reverting a part of
254f40fd535ef57dee2bcc4afd97840749ce5918 where it was removed during a
Midgard refactor.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4025>
2 files changed