thermal: cpu_cooling: fix doc comment over struct cpufreq_cooling_device

cooling_cpufreq_lock isn't used to protect this structure and so the comment
over it is outdated. Fix it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 6f2d41e..cc10641 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -40,9 +40,8 @@
  *	frequency.
  * @allowed_cpus: all the cpus involved for this cpufreq_cooling_device.
  *
- * This structure is required for keeping information of each
- * cpufreq_cooling_device registered. In order to prevent corruption of this a
- * mutex lock cooling_cpufreq_lock is used.
+ * This structure is required for keeping information of each registered
+ * cpufreq_cooling_device.
  */
 struct cpufreq_cooling_device {
 	int id;