OmniGears: AD brightness - do your math homework max :)

http://jira.omnirom.org/browse/OMNI-752

Change-Id: Ibb123378c47a6e4c337740c95d5eb4eead4cd4b5
Merge pull request #11 from omnirom/android-4.4

OmniGears: AD brightness - do your math homework max :)