backlight: Fix dimmed display doesn't go to sleep
Firmware didn't start sleep countdown if
1. Display was already dimmed
2. Fade out timer was set
You can reproduce this by:
1. Set fade out timer. For example, 500ms
2. Wait till display will be dimmed and go to sleep
3. Switch hold ON or plug headphones
Change-Id: I27ca857aa8db4551bd9caad4815cd73a64bf6185
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