drm/i915: spt does not have pch backlight override bit
SPT is always in the PCH override mode, and the bit MBZ. Only set override on LPT. v2: check for PCH version (Ville) Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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