pm/Kconfig: make power management settings dependent on SCHED_WORKQUEUE
pm/Kconfig: make power management settings dependent on SCHED_WORKQUEUE

* The power managment system depends on workqueue support, which
  checks at compile time and cause build failure, if workqueues
  disabled. However, it seems necessary to make PM
  option dependent on SCHED_WORKQUEUE itself.

Signed-off-by: Oleg Lyovin <9e7fd33cf90c7e429276114f54b1f8488150523e@partner.samsung.com>

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