Revert "cpufreq: Introduce new relation for freq selection"

This reverts commit b618200237e1799920aa4f0747336206d60ecc7f.
Revert "cpufreq: bail early if target_freq == current."

This reverts commit b29c05604f1aa7502b6689e6ad8d7119595a0e56.
Revert "cpufreq: add generic get_cpuidle_time to the cpufreq headers so that we don't need to implement this everytime we need it."

This reverts commit 7f971f1ebc645ef1b3a64deab25dae919d80e4e9.