msm: hotplug: Cleanup hotplugging routines
cpufreq: add new routine cpufreq_verify_within_cpu_limits()

Most of the users of cpufreq_verify_within_limits() calls it for
limiting with min/max from policy->cpuinfo. We can make that code
simple by introducing another routine which will do this for them
automatically.

This patch adds another routine cpufreq_verify_within_cpu_limits()
and updates others to use it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
msm: hotplug: Optimize hotplugging routines

- Power down the slowest cpu
- Move checks from callback to calling function
- Clean it up a bit
msm: hotplug: Add pm ops
msm: hotplug: Fix symbol export
msm: hotplug: Fixup sysfs interface

* Use proper return values
* Fix store_down_lock_duration()
* Add some more checks
* Cleanup some mess
msm: hotplug: Update threshold values and down lock duration

* Power up additional cpus earlier
* Power down cpus later
* Keep cpus online at least 5 seconds