staging: lustre: remove CFS_DECL_WAITQ() macro

Just use DECLARE_WAIT_QUEUE_HEAD() instead.

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