Wangxun: vf: Implement some ethtool apis for get_xxx

Implement some ethtool interfaces for obtaining the status of
Wangxun Virtual Function Ethernet.
Just like connection status, version information, queue depth and so on.

Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250924082140.41612-1-mengyuanlou@net-swift.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>