cpufreq: Simplify cpufreq_can_do_remote_dvfs()

The if () in cpufreq_can_do_remote_dvfs() is superfluous, so drop
it and simply return the value of the expression under it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>