AutoBrightness: Add support for one shot auto-brightness

- Only update auto brightness one time when screen is turned on.
- Can be useful on devices where sensor is not accurate.

Author: Eamon Powell <eamonpowell@outlook.com>
Date:   Sun Aug 29 11:37:44 2021 +1000

    fixup! AutoBrightness: Add support for one shot auto-brightness:

    * Remove unnecessary newlines
    * Fix incorrect indentation
    * Fix typo in comments

    Change-Id: I7d6071f4344605b3dcc3f1c33ac4390f1020e03f

Change-Id: I5187fdb7765550d4eaa999317ab95f487d44c8d8