msm: board-8930: add gpio-controlled backlight function
The function pointer is passed to driver to turn on/off backlight to
avoid garbage display.
CRs-fixed: 408728
Change-Id: Ibb218246bd3414b7004289e5afd0594a186374f1
Signed-off-by:
Huaibin Yang <huaibiny@codeaurora.org>
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