put function prototype outside of #ifdef block, to fix:
arch/x86_64/kernel/time.c:941: warning: implicit declaration of
function `oem_force_hpet_timer'
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Cc: <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>