Fix dracut warnings during genimage on newer OSs

[Obihoernchen]

Fixes the following errors when building stateless EL 9 images.

/bin/dracut: line 1054: /sys/module/firmware_class/parameters/path: No such file or directory
findmnt: can't read /proc/mounts: No such file or directory
/usr/lib/dracut/modules.d/00systemd/module-setup.sh: line 168: /dev/fd/63: No such file or directory
/proc/ is not mounted. This is not a supported mode of operation. Please fix
your invocation environment to mount /proc/ and /sys/ properly. Proceeding anyway.