staging: lustre: don't use time() or CFS_CURRENT_TIME

It's just "CURRENT_TIME", don't redefine a macro for something so simple
as that...

Cc: Peng Tao <tao.peng@emc.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>