add id_table to serio drivers to split initial matching
       and probing routines for better sysfs integration and
       to assist hotplug scripts in loading proper drivers.
       Add serio_hotplug to notify userspace about new ports.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>