kthread: add kthread_work tracepoints

While migrating some code from wq to kthread_worker, I found that I missed
the execute_start/end tracepoints.  So add similar tracepoints for
kthread_work.  And for completeness, queue_work tracepoint (although this
one differs slightly from the matching workqueue tracepoint).

Link: https://lkml.kernel.org/r/20201010180323.126634-1-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
Cc: Rob Clark <robdclark@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Phil Auld <pauld@redhat.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vincent Donnefort <vincent.donnefort@arm.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Ilias Stamatis <stamatis.iliass@gmail.com>
Cc: Liang Chen <cl@rock-chips.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "J. Bruce Fields" <bfields@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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