SystemUI: fix memory leaks

ContentObservers are being registered without being unregistered,
causing old objects not to be garbage collected. This causes memory
leak if the classes are destroyed and recreated throughout the
device's uptime.

SearchPanelView is recreated every time the screen is turned on.
StatusBarIconView is created every time a notification is triggered.

JIRA: CYAN-650
Change-Id: Iabd3221fc2b0c848396af1790fd09424be602e7e
QuickSettings: cleanup
Removed unnecessary references to QuickSettingsContainerView, LayoutInflater
Tile layout is set by constructor

Change-Id: Ied57bf6613594864db0201c2af514fbe4bb651ed

Conflicts:

	packages/SystemUI/src/com/android/systemui/quicksettings/DockBatteryTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/ProfileTile.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java