drm/i915: do not save/restore backlight registers in KMS
The backlight enable code now has the smarts to do the right thing. Only do backlight register save/restore in UMS. Some VLV specific code gets dropped as UMS is not supported on VLV. v2: Move save/restore to UMS instead of removing completely (Daniel). Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NImre Deak <imre.deak@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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