Legacy extras: build Cygn LockClock

related to: http://gerrit.aospal.com/#/c/442/
needs: https://github.com/CyanogenMod/android_packages_apps_LockClock

Signed-off-by: ayysir <ayysir@aospal.com>
Change-Id: Ied73a94592e8d845caa571621ed17b32ba6e0cf8