cpufreq: schedutil: Make default depend on CONFIG_SMP

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: Arnd Bergmann <arnd@arndb.de>
Fixes: bf7cdff19429 (cpufreq: schedutil: Make it depend on CONFIG_SMP)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>