i9100: Remove keyguard security height overlay

before: http://img255.imageshack.us/img255/2807/screenshot2013031120065.png
after: http://img547.imageshack.us/img547/6741/screenshot2013031323274.png

Change-Id: Id037b80254fb8f3c9ad359f9f19b971c65870b48
Merge remote-tracking branch 'upstream/cm-10.1' into cm-10.1