fix for regression that network time syncing is disabled for VMs

This patch reverts the no_clock_sync patch for guests VMs.

Bug: 1174279
Change-Id: I7ad33d4b8e439cb7c491ae097b91f3e197cf04d9
usage-reminder: add email headers

Bug: 1169293
Change-Id: Ibe3b2b57ab2f0e728bf13f30a43817146c8d7d0e