Revert "cpu: add changes to headers"

This reverts commit fd519a0628cde367a4491dfeb576eb4b1b280cc5.
Revert "cpu: new cpufreq, cpuidle setup"

This reverts commit 6cbb47ec292f3abbaaa6b71cc48a56beb35a86ce.
oom, memctrl: 3.1
cpuidle, freq_stats: adapt changes from reverted commit