ci: make sure all lava-builders have libvulkan

ci: make sure all lava-builders have libvulkan

In the next commit, we'll start building Zink in the meson-testing step,
and because mega-drivers end up stuffing all dependencies in the same
shared-object, we end up requiring libvulkan for other drivers as well.

So let's no longer track separately who needs vulkan and who doesn't,
and just always install it.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8879>