drm/i915: restore cursor and sprite state when forcing a config restore v2

Needed for VT switchless resume.

v2: cursor state is now handled correctly in crtc_enable (Daniel)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>