s5j/mac: drop udp_initialize() and udp_free()
udp_initialize() and udp_free() are never called and not in use.
* s5j_ethinitialize() with the appropriate interface number.
*
****************************************************************************/
-void udp_initialize(void)
-{
-
-}
-void udp_free(void)
-{
-
-}
void up_netinitialize(void)
{
