Merge branches 'arm-asymmetric-support-v3', 'cpuidle-next-v4', 'per-cpu-thread-hotplug-v3', 'fast-slow-cpu-dt-v1', 'wq-hotplug-v1' and 'config-fragments' into big-LITTLE-MP-v4

Based on v3.5

$ gco -b big-LITTLE-MP-v4 v3.5
$ git merge arm-asymmetric-support-v3 cpuidle-next-v4 per-cpu-thread-hotplug-v3 per-task-load-average-v2 task-placement-v1 fast-slow-cpu-dt-v1 wq-hotplug-v1 config-fragments