Upstream in commit 3e1e58d64c3d ("net: add generic selftest support") in
version 5.13 added generic selftests module and usb-net-asix already
depends on it, in version 5.18 via commit 1710b52d7c13 ("net: usb:
smsc95xx: add generic selftest support") it will be used by
usb-net-smsc95xx as well.
Signed-off-by: Petr Štetiar <ynezz@true.cz>