vulkan/wsi: Use the interface from the real modifiers extension

vulkan/wsi: Use the interface from the real modifiers extension

The anv implementation still isn't quite complete, but we can at least
start using the structs from the real extension.

v2: Fix circular pNext list (Lionel)

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3434>