net: txgbe: add ethtool stats support

Support to show ethtool statistics.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Link: https://lore.kernel.org/r/20231011091906.70486-3-jiawenwu@trustnetic.com


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