panfrost: Force late pixel kill when depth/stencil is written from the FS

If we don't do that, pixels might be killed early thus preventing the
fragment shader from being called and updating the depth/stencil value.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7501>
3 files changed