drm/i915: kill pc8.disable_count

Since after the latest patches it's only being used to prevent
getting/putting the runtime PM refcount.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
4 files changed