mako_hotplug: clean-up

* clean up the store functions using proper and modern kstrtoul

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
mako_hotplug: bugfixing

* fix a bug where cpu_smash()->cpus_cpufreq_work()->cpus_offline_work()
was being called every 100ms

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>