Don't let dracut generate implicit devices in hostonly mode
Don't let dracut generate implicit devices in hostonly mode

If hostonly_default_device is enabled, details from the host system devices
leak into the initrd which we want to avoid. For example, this caused the
seclabel mount option to leak into the mount options of my mkosi generated
BTRFS mount options rendering the image unbootable in QEMU.

systemd/mkosi,systemd/mkosi