Adds the following kernel modules for k3s:

* xt-physdev
* xt-nflog
* xt-limit
* nfnetlink-log

Without them, the k3s network-policy-controller reports failures in the log
related to iptables-restore.
Signed-off-by: Richard Neill <richard.neill@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>