Framework: Add Fast Charge widget - (1/2)

Change-Id: Iac753914624ce82e0ccd2a89dda66870923fa5f4

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/powerwidget/PowerButton.java
	packages/SystemUI/src/com/android/systemui/statusbar/powerwidget/PowerWidget.java
Frameworks: Add fast charge QS toggle and other

this commit add
- qs toggle
- interactive reacting with pw toggle
- option stays after reboot
- option is hidden if kernel doesn't support
- code cleanup

Change-Id: I137720a7fe1acb7b36bec0f68ac0e5b6aa3fcbd0

Conflicts:
	packages/SystemUI/res/values/strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java