tg3: add device id of Apple Thunderbolt Ethernet device

The Apple Thunderbolt ethernet device is already listed in the driver,
but not hooked up in the MODULE_DEVICE_TABLE().  This fixes that and
allows it to work properly.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>