cpufreq: schedutil: Remove update_lock comment from struct sugov_policy definition

Currently, update_lock is also used in sugov_update_single_freq().

The comment is not helpful anymore.
Signed-off-by: Yue Hu <huyue2@yulong.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/sched/cpufreq_schedutil.c

@@ -26,7 +26,7 @@ struct sugov_policy {
 	struct sugov_tunables	*tunables;
 	struct list_head	tunables_hook;
 
-	raw_spinlock_t		update_lock;	/* For shared policies */
+	raw_spinlock_t		update_lock;
 	u64			last_freq_update_time;
 	s64			freq_update_delay_ns;
 	unsigned int		next_freq;