drm/i915: Parse LFP brightness control field in VBT
These fields in VBT indicates the PWM source which is used and also the controller number. v2 by Jani: check for out of bounds access, some renames, change default type, etc. v3 by Jani: s/INTEL_BACKLIGHT_CABC/INTEL_BACKLIGHT_DSI_DCS/ Signed-off-by: Deepak M <m.deepak@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/eee2f7b683a081f006a7df1ddad9b20fbf53c48c.1461676337.git.jani.nikula@intel.com
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