cpufreq: stats: remove unused cpufreq_stats_attribute

It was never used, but is there since the first commit. Remove it.
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq_stats.c

@@ -33,11 +33,6 @@ struct cpufreq_stats {
 
 static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);
 
-struct cpufreq_stats_attribute {
-	struct attribute attr;
-	ssize_t(*show) (struct cpufreq_stats *, char *);
-};
-
 static int cpufreq_stats_update(unsigned int cpu)
 {
 	struct cpufreq_stats *stat;