Revert "cpufreq: Break out early if freq equals to target_freq"

This reverts commit 48b598d4913de0114f2da44bbd0f68632628ae69.

Revert "cpufreq: Retain only online cpus in managed_policy->cpus"

This reverts commit 6644935be750dd98a49ae9cfaba5176c8408ef5e.

Revert "cpufreq: Manage only online cpus"

This reverts commit 5fd398345f61a3b51dc4afac6508267fc79b5493.