cpufreq: Export disable_cpufreq()

This is used by the tegra124-cpufreq driver.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

drivers/cpufreq/cpufreq.c

@@ -107,6 +107,7 @@ void disable_cpufreq(void)
 {
 	off = 1;
 }
+EXPORT_SYMBOL_GPL(disable_cpufreq);
 static DEFINE_MUTEX(cpufreq_governor_mutex);
 
 bool have_governor_per_policy(void)