Revert "Settings: remove preference if device hasn't LockClock installed"

even more dead code from CM

This reverts commit 3712830dd962e4aa07a646d10da2b46a8fa8e3a7.

Change-Id: I48ed8d3a116089ab3e6499ce2b2c1289cf1523a4
Merge "Revert "Settings: remove preference if device hasn't LockClock installed"" into kk44