cpufreq: governors: fixes to enable compiling Custom Governors as kernel modules

Otherwise you get this:

ERROR: nr_running [drivers/cpufreq/cpufreq_smartass2.ko] undefined!
ERROR: nr_running [drivers/cpufreq/cpufreq_pegasusq.ko] undefined!
ERROR: cpu_up [drivers/cpufreq/cpufreq_pegasusq.ko] undefined!
ERROR: unlock_policy_rwsem_write [drivers/cpufreq/cpufreq_badass.ko] undefined!
ERROR: lock_policy_rwsem_write [drivers/cpufreq/cpufreq_badass.ko] undefined!
ERROR: sched_setscheduler_nocheck [drivers/cpufreq/cpufreq_adaptive.ko] undefined!