EthIpIface: Use a linked list for LRU instead of times.
EthIpIface: Use a linked list for LRU instead of times.

This saves some space for each ARP entry.

ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter