tmf: make latches synchronized in abstract analysis module [bug 485793]

tmf: make latches synchronized in abstract analysis module [bug 485793]

Fixes a build instability caused by schedule (by design) spawning a job
that runs asynchronously. This makes cancellation racy since it can occur
before said job starts.

Change-Id: I93617efb80f4eb196ef0aba5cbe72e67917c876c
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/83786
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Hudson CI
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>