Revert "Remove duplicated Show Clock checkbox"

This reverts commit 6ec2a60947719ba07362510a36459624dbdef981.

Change-Id: I39b49ed0d6110f1fc4b03d03efe1cc0f482c2808
Merge "Revert "Remove duplicated Show Clock checkbox"" into android-4.4
Revert "Forward port AM/PM Style Settings"

This reverts commit f5171f849b367dc3d2fc3df100f333d594c564ca.

Change-Id: Icff516ca3b484872e3064ac13454dc91a836890e