panvk/v10+: Advertise nullDescriptor support

Advertise support for VK_EXT_robustness2 with only the nullDescriptor
feature enabled.

Except for index buffers, the same implementation should work for v9 as
well.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35609>
1 file changed