workqueue: Detach workers directly in idle_cull_fn()

The code to kick off the destruction of workers is now in a process
context (idle_cull_fn()), and the detaching of a worker is not required
to be inside the worker thread now, so just do the detaching directly
in idle_cull_fn().

wake_dying_workers() is renamed to detach_dying_workers() and the unneeded
wakeup in wake_dying_workers() is also removed.

Cc: Valentin Schneider <[email protected]>
Signed-off-by: Lai Jiangshan <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>

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