HEADSUP: cpufreq import complete, acpi_throttling changed

I've finished the major work of importing cpufreq.  As part of this, the 
sysctls for acpi throttling have been removed.  The power_profile script 
has been updated, so you can use performance/economy_cpu_freq= in 
rc.conf to set AC on/offline cpu frequencies.  The acpi throttling 
support has been compiled into acpi_perf.ko so load that to get 
throttling.  Do a sysctl dev.cpu to get an understanding of the cpufreq 
sysctls.

If you have throttling, please test the new configuration to be sure it 
still works as before.  Final upcoming work will be manpage support and 
bugfixing as necessary.

I'd also like to issue a call for developers to help by porting older 
drivers (like longrun) and out-of-tree new drivers (like powernow-k7/k8 
and speedstep-m) to the cpufreq interface.  It's very simple and you 
just have to figure out if your driver is absolute or relative, and 
convert values to the proper units (percent in hundredths, power in mW, 
etc.)  Once that is done, please send me the diff for review before 
commit so I can make sure it works properly.

Thanks,
-- 
Nate