CHV hard hangs on reading on 0x112f4.

References: https://bugs.freedesktop.org/show_bug.cgi?id=80893


Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>