net: libwx: support hardware statistics

Implement update and clear Rx/Tx statistics.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Link: https://lore.kernel.org/r/20231011091906.70486-2-jiawenwu@trustnetic.com


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