The function pointer is passed to driver to turn on/off backlight to avoid garbage display. (cherry picked from commit a07d78743024144158a7b2cc0c194ae75e9b6bea) CRs-fixed: 408728 Change-Id: Ibb218246bd3414b7004289e5afd0594a186374f1 Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>