Added following self-explanatory netlink events.

        W1_SLAVE_ADD = 0,
        W1_SLAVE_REMOVE,
        W1_MASTER_ADD,
        W1_MASTER_REMOVE,
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>