SystemUI: More memory leak fixes

PS2: fix Clock FC

Change-Id: I0929786c33475bb471db90f757321502a19c8702
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge "SystemUI: More memory leak fixes" into jb-mr1
Merge remote-tracking branch 'upstream/jb-mr1' into jb-mr1