SystemUI: Fix build warnings

Change-Id: I3493428eb5192bf39b31bf8a5c66406660af1aca
Merge branch 'CyanogenMod' into cm-10.1

Signed-off-by: Humberto Borba <humberos@gmail.com>
Merge remote-tracking branch 'sgt7/cm-10.1' into cm-10.1-sgt7-linaro