Revert "Add PowerManager integration for button and keyboard backlight."

This reverts commit b4d09e718a912200a8e92f1c473bfd7b3f7bf75e.
Framework: Add TouchKey Light Duration Pref

Gives the option to change duration of touchkey backlights

Must be enabled in overlay

Change-Id: I9175fe1aeb998e8ebdd5793bc1c8633b5008d5e1

Conflicts:
	services/java/com/android/server/power/PowerManagerService.java
Fix Custom backlight duration

Change-Id: I12c5784d81bbc063207e27365fd892cd521c9092

Conflicts:
	services/java/com/android/server/power/PowerManagerService.java
Frameworks: several fixes for TouchKey light duration

1. allow on all states window manager to overwrite current
   brightness state
2. fix duration calculation problem

Change-Id: I9956b1e6b9cca9d0823cb22749b3d2ec108e3c2b
Frameworks: fix typo

causes broken backlight on hardwarekeys
if it is set to always on

sorry for that

cheers

Change-Id: I4747239f681f4714ac1ab767a1be48219e1b620f