cpufreq: ondemand: fix wrong delay sampling rate

Restore the correct delay value for ondemand's od_dbs_timer, as it was
changed erroneously in commit 83f0e55 (cpufreq: governors: remove
redundant code).
Signed-off-by: NFabio Baltieri <fabio.baltieri@linaro.org>
Reviewed-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq_ondemand.c

@@ -234,7 +234,8 @@ static void od_dbs_timer(struct work_struct *work)
 			dbs_info->sample_type = OD_SUB_SAMPLE;
 			delay = dbs_info->freq_hi_jiffies;
 		} else {
-			delay = delay_for_sampling_rate(dbs_info->rate_mult);
+			delay = delay_for_sampling_rate(od_tuners.sampling_rate
+						* dbs_info->rate_mult);
 		}
 	}