msm: msm_fb: Backlight change after resuming from suspend state

This change will fix the flicker issue when the system resume
from suspend state.The change will update the first backlight
level as scaled backlight level when the device come from
sleep state and then flicker is not obseved as the backlight
level will be same as before.

Change-Id: Ibb03016efa3b076959fa7a10da104cf7277e9f16
CRs-fixed: 473283
Signed-off-by: Mukesh Jha <cmjha@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>