Replace usbnet_get_stats64() with new identical core function
dev_get_tstats64() in all users and remove usbnet_get_stats64().
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Acked-by: NBjørn Mork <bjorn@mork.no>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>