mach-msm: dyn_hotplug: Check for valid return of cpufreq_get_policy

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
mach-msm: dyn_hotplug: Online all CPUs on resume

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>