zink: do not request scoped memory barriers

zink: do not request scoped memory barriers

While barriers in Vulkan are scoped, we do not handle
nir_intrinsic_scoped_barrier, so we do not support them from NIR.

The reason why this hasn't been a problem seems to be that VTN is the
only place that respects them, so we haven't seen them yet.

But if the GLSL compiler starts respecting the setting, things will
start blowing up. There's WIP patches for this in !3339 already.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9949>