Revert "cpufreq: Only call cpufreq_out_of_sync() for driver that implement cpufreq_driver.target()"

This reverts commit 7eb205ab7896718ee6d20e9b1cefa3adbcd5970a.
Revert "cpufreq: Notify governors when cpus are hot-[un]plugged"

This reverts commit 7e0c62ba83d2c35e4ccb3fdf6d9fc531c7eb947d.
Revert "cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur"

This reverts commit 2e3d745435432554979529478175e34a552164d1.