myricom: update to 64 bit stats

Driver was already keeping 64 bit counters, just not using the new interface.

Ps: IMHO drivers should not be duplicating network device
stats into ethtool stats. It is useless duplication.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>