Jani spotted this when reviewing my earlier patch to remove the driver
internal usage of this field in:

  Commit 3cf91ada ("backlight: Nuke BL_CORE_DRIVER1")
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Acked-by: NDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>