cpufreq / core: Fix typo in comment describing show_bios_limit()

show_bios_limit is mistakenly written as show_scaling_driver in a comment
describing purpose of show_bios_limit() routine.

Fix it.
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq.c

@@ -581,7 +581,7 @@ static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
 }
 
 /**
- * show_scaling_driver - show the current cpufreq HW/BIOS limitation
+ * show_bios_limit - show the current cpufreq HW/BIOS limitation
  */
 static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
 {