cpufreq: schedutil: Make default depend on CONFIG_SMP

CPU_FREQ_GOV_SCHEDUTIL gained a dependency on SMP, so now we
get a warning if it gets selected by CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
without SMP:

warning: (CPU_FREQ_DEFAULT_GOV_SCHEDUTIL) selects CPU_FREQ_GOV_SCHEDUTIL which has unmet direct dependencies (CPU_FREQ && SMP)

This adds another dependency to avoid the problem.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Fixes: bf7cdff1 (cpufreq: schedutil: Make it depend on CONFIG_SMP)
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/Kconfig

@@ -110,6 +110,7 @@ config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
 
 config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
 	bool "schedutil"
+	depends on SMP
 	select CPU_FREQ_GOV_SCHEDUTIL
 	select CPU_FREQ_GOV_PERFORMANCE
 	help