Frameworks: add abillity to use quick settings pulldown on the left side

This commit gives the ability to use quick settings pulldown on the left
or right edge of the statusbar. As well this respects still RTL layouts
where it logically should change to the oposite side.

Change-Id: Ibdf0894347e1ed3871f685afd5a29f47efe23a4b

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java