selftests: virtio_net: add forgotten config options

One may use tools/testing/selftests/drivers/net/virtio_net/config
for example for vng build command like this one:
$ vng -v -b -f tools/testing/se

selftests: virtio_net: add forgotten config options

One may use tools/testing/selftests/drivers/net/virtio_net/config
for example for vng build command like this one:
$ vng -v -b -f tools/testing/selftests/drivers/net/virtio_net/config

In that case, the needed kernel config options are not turned on.
Add the missed kernel config options.

Reported-by: Jakub Kicinski <[email protected]>
Closes: https://lore.kernel.org/netdev/[email protected]/
Reported-by: Matthieu Baerts <[email protected]>
Closes: https://lore.kernel.org/netdev/[email protected]/
Fixes: ccfaed04db5e ("selftests: virtio_net: add initial tests")
Signed-off-by: Jiri Pirko <[email protected]>
Reviewed-by: Xuan Zhuo <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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