SystemUI: More memory leak fixes

PS2: fix Clock FC

Change-Id: I0929786c33475bb471db90f757321502a19c8702
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java