Switch to using ndo_get_stats64 to get 64bit statistics.

v3:
[cascardo] use rtnl_link_stats64 as port stats
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NThadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>