kmod/whitelist: Add configuration file

[Donald Buczek (donald)]

Requires mariux64/bee-files#3358
Obsoletes #532

Our modified kmod will only allow the modules enumerated in /etc/kmod/whitelist.conf to be loaded. See
mariux64/kmod@v34.2...v34.2-mpi. If the file doesn't exist, any module can be loaded.

Add a initial version of that file from the modules currently loaded on any mx64 system.

If an attempt to load a module which is not in the list is made, a message is sent to syslog:

2026-05-17T14:14:17.088679+02:00 dose  modprobe: kmod whitelist: module 'af_packet' not in whitelist, denied

[Donald Buczek (donald)]

Should we start with a "warn only " mode for a few days?

[Donald Buczek (donald)]

The file now includes whitelist-test-mode. With this, we only log modules, which would have been denied by the whitelist feature. When we keep this for a while, we might get more confidence to enable the normal mode, which actually denies the module loading.