drm/i915: load the LUT before pipe enable on ILK+

commit 9c54c0dd upstream.

Per the specs and to address
https://bugs.freedesktop.org/show_bug.cgi?id=36888

.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>