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
use related_cpus to apply correctly to new online cpus

Conflicts:
	arch/arm/mach-msm/cpufreq.c

(squash of two commits from maxwen)

Change-Id: I823153efd2e0df4b49fa1915ab5084ba97e92a97