vulkan: factor out wsi dependencies

vulkan: factor out wsi dependencies

In commit 530927d3f6a303d9 ("vulkan/util: generate instance/device
dispatch tables") we started generating instance dispatch tables some
of them (like wayland) require external headers.

This commit moves the dependencies up one level so that they apply the
whole vulkan directory. We use them for both the util & overlay layer.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 530927d3f6a303 ("vulkan/util: generate instance/device dispatch tables")
Reviewed-by: Eric Engestrom <eric@engestrom.ch>