sysctl dev.rtc.max-user-freq no longer exists in the kernel

[Chuck Anderson <cra WPI EDU>]

What happened to this sysctl?  It appears that some stuff depends on 
this setting, e.g. kqemu.  There is only a hpet.max-user-freq now and 
I get this funky permission error on 'sysctl -a':

# /sbin/sysctl -a | grep freq
error: permission denied on key 'kernel.sched_nr_migrate'
dev.hpet.max-user-freq = 64

# /sbin/sysctl -n -q dev.rtc.max-user-freq
error: "dev.rtc.max-user-freq" is an unknown key