net: ethtool: set a default driver name

The netdev (e.g. ifb, bareudp), which not support ethtool ops
(e.g. .get_drvinfo), we can use the rtnl kind as a default name.

ifb netdev may be created by others prefix, not ifbX.

Cc: Arnd Bergmann <[email protected]>
Cc: Hao Chen <[email protected]>
Cc: Heiner Kallweit <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Danielle Ratson <[email protected]>
Cc: Andrew Lunn <[email protected]>
Signed-off-by: Tonghao Zhang <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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