cpufreq: Give consistent names to cpufreq_policy objects

They are called policy, cur_policy, new_policy, data, etc.  Just call
them policy wherever possible.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 3a3e9e06d0c11b8efa95933a88c9e67209fa4330
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


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