Revert "cpuidle: Fix finding state with min power_usage"

This reverts commit 6736ed915e1cb58b82f4504cfdf02e82e36f3aab.
Revert "cpuidle: Get typical recent sleep interval"

This reverts commit 5af8f7ab2dc0cb7ffa6f4f5d771111a100843eb0.
Revert "cpuidle: Quickly notice prediction failure in general case"

This reverts commit 2559d60fe37fc60875bce333953cb5f54dd76579.