Bringing pie controls to Baked. (1/2)

kanged from pa and xylon.

Signed-off-by: travp624 <travp624@gmail.com>
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.

based from cm's commit

Signed-off-by: travp624 <travp624@gmail.com>