This tracer was temporarily removed in 64166699 (workqueue:
temporarily remove workqueue tracing, 2010-06-29) but never
reinstated after concurrency managed workqueues were completed.
For almost two years it hasn't been compilable so it seems nobody
is using it. Delete it.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Acked-by: NFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: NTejun Heo <tj@kernel.org>