cpufreq: schedutil: Make it depend on CONFIG_SMP

Make the schedutil cpufreq governor depend on CONFIG_SMP, because
the scheduler-provided utilization numbers used by it are only
available with CONFIG_SMP set.

Fixes: 9bdcb44e391d (cpufreq: schedutil: New governor based on scheduler utilization data)
Reported-by: Steve Muckle <steve.muckle@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/Kconfig

@@ -200,7 +200,7 @@ config CPU_FREQ_GOV_CONSERVATIVE
 
 config CPU_FREQ_GOV_SCHEDUTIL
 	tristate "'schedutil' cpufreq policy governor"
-	depends on CPU_FREQ
+	depends on CPU_FREQ && SMP
 	select CPU_FREQ_GOV_ATTR_SET
 	select IRQ_WORK
 	help