Move DeskClock to lineage snippet

* We have now forked this app since we are using the android 11 version
  of it. This creates conflicts on monthly AOSP merges since the android
  12 version has been completely rewritten in kotlin. Let's move it to
  avoid unnecessary conflicts.

Change-Id: I5de5e5cab07b0703593f370ad087d466dd07d9f7