ANV needs these because we have a different dispatch table for each
hardware generation and Vulkan requires that the device entrypoints
returned from vkGetInstanceProcAddr work regardless of which device
they're used with.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8676>