intel: Store the aperture size in devinfo.
We will later use the devinfo from iris_bufmgr, where we don't have access to the screen pointer. And since we are moving it, we can reuse it in Anv nad i965.
We will later use the devinfo from iris_bufmgr, where we don't have access to the screen pointer. And since we are moving it, we can reuse it in Anv nad i965.