sched/wake_q: Add helper to call wake_up_q after unlock with preemption disabled

A common pattern seen when wake_qs are used to defer a wakeup
until after a lock is released is something like:
  preempt_disable();
  raw_spin_unlock(lock);
  wake_up_q(wake_q);
  preempt_enable();

So create some raw_spin_unlock*_wake() helper functions to clean
this up.

Applies on top of the fix I submitted here:
 https://lore.kernel.org/lkml/[email protected]/

NOTE: I recognise the unlock()/unlock_irq()/unlock_irqrestore()
variants creates its own duplication, which we could use a macro
to generate the similar functions, but I often dislike how those
generation macros making finding the actual implementation
harder, so I left the three functions as is. If folks would
prefer otherwise, let me know and I'll switch it.

Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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