Glacier: fix panel backlight
When automatic backlight scaling is not active and set to the lowest
setting we get a blackout, this prevents that

Change-Id: Idc946f56c87afb9b1b471f2b734860c9b55737a1
Merge "Glacier: fix panel backlight When automatic backlight scaling is not active and set to the lowest setting we get a blackout, this prevents that" into jellybean