Currently the ethtool_regs version is set to 0 for all DSA drivers.

Use this field to store the chip ID to simplify the pretty dump of
any interfaces registered by the "dsa" driver.
Signed-off-by: NVivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>