The cpu_set_cclk() function was only used in a single source file so far.
Indicate this setting also by the corresponding linkage specifier.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>