[PATCH] CPU hotplug: fix hpet sectioning

With hpet enabled, cpu hotplug uses some routines marked with __init.

Signed-off-by: Shaohua <Li&lt;shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>