Byt doesn't have rc6p and rc6pp support and even more important the
the offsets of the residency registers there's something else. So Just
return a constant 0 to avoid upsetting userspace tools like powertop.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Explain a bit in the commit message what's going on.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>