It also makes some sense IMO to have these two functions separate
irrespective of the number of callers.

Only the single caller for now, but that will change as we add more
PPGTTs.
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Resolve conflict.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>