Remove dead entry from net wan Kconfig and net wan Makefile..  This entry is
left over from 2.4 where synclink used syncppp driver directly.  synclink
drivers now use generic HDLC

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>