drm/panel: otm8009a: Use new backlight API
The backlight API provides new functions to enable and disable the backlight and which hide the intricacies of achieving the correct result. Signed-off-by:Philippe Cornu <philippe.cornu@st.com> Signed-off-by:
Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180423141054.13128-5-philippe.cornu@st.com
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