Port back Notification Drawer Brightness Slider from slim4.2 (1/2)

Conflicts:
	packages/SystemUI/res/layout/status_bar_expanded.xml
	packages/SystemUI/res/values/dimens.xml
	packages/SystemUI/res/values/slim_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/powerwidget/PowerWidget.java
Fix Duplicate Statubar Brightness Control (1/2)

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelView.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java