Revert^2 "Move brightnessMaxReason to DisplayBrightnessState"

This reverts commit 3ebc0acddc4b3b2dcddceab3d0c99ed7368f1b48.

Reason for revert: bug was unrelated to CL

Change-Id: I1c3b7e47f9501616b76026a6cbb04dda43337519
6 files changed