cpufreq: rename __cpufreq_set_policy() as cpufreq_set_policy()

Earlier there used to be two functions named __cpufreq_set_policy() and
cpufreq_set_policy(), but now we only have a single routine lets name it
cpufreq_set_policy() instead of __cpufreq_set_policy().

This also removes some invalid comments or fixes some incorrect comments.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 037ce8397d23b2f84ccfb879cf4b43277b0454e3
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[junjiew@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>