Vulkan: Make layers not depend on libvulkan. On Android the layers were adding a dependency on libvulkan. This isn't necessary. We can move this dependency up the change to libANGLE. Bug: angleproject:2935 Change-Id: I63460c05ca99c5afb6e863af9d6142576aa910b9 Reviewed-on: https://chromium-review.googlesource.com/c/1301721 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>