cpufreq: Unified governor/scaling switching (squashed commits)

cpufreq: unified governor and scaling min and max switching governor scaling_min_freq and scaling_max_freq will be populated to all online cpus immediately

cpufreq: unified governor and scaling min and max switching use related_cpus to apply correctly to new online cpus

cpufreq: block hotplugging during multi-cpu operations

Change-Id: Id1cf038c5f23ba9c921fc7b398e983e6962fe3d0
cpufreq: dont apply multi-cpu values if not changed

Conflicts:

	drivers/cpufreq/cpufreq.c