kernel: Revert the callout_stop_sync() changes in the wlan stack.

Our locking is quite different here and it could cause a deadlock with
ieee80211_newstate_task().

Pointed-out-by: sephe
perfbias: Implement Intel performance-energy hint support

This hint is set on per-logical CPU.  0 delivers highest performance;
15 maximizes energy saving.  It could be set through sysctl nodes
machdep.perfbiasX (X is the CPU id).

It is linked into i386 and x86_64 GENERIC kernel.

* We may want to make powerd(8) to aware of these sysctls.
acpica/cpu: Add missing bus_generic_probe

Used by coretemp(4) and perfbias(4).  Maybe many others
acpi/cstate: Remove unnecessary bus_generic_{attach,probe}()

They were inheritted when acpi_cpu_cstate.c was splitted from acpi_cpu.c.
C-state is a leaf device, nothing will be its children.