mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared

That will allow us to avoid using cpufreq-dt platform data.

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