Revert "cpufreq: ondemand: Remove unused waitqueue"

This reverts commit dcac2ef98ed5556aca2da7108da3f2584477e960.

Change-Id: Ie145d3f5caea981c90d9304a1846060b000a2431
Revert "cpufreq: ondemand: Use hotplug thread infrastructure"

This reverts commit 931ea3813ebab2b205b5a4cc92260cc49106d5af.

Change-Id: I8b8bd4428831b34e0f0bc2bae72e8185fb61e9c9
Merge topic 'ondemand_test' into android-4.4

* changes:
  Revert "cpufreq: ondemand: Use hotplug thread infrastructure"
  Revert "cpufreq: ondemand: Remove unused waitqueue"