vm: Remove tmpfiles config for /etc/passwd
We don't want a pre-created root user, this prevents us from overriding
the root password via the
io.systemd.credential:passwd.plaintext-password.root
credential that
we can set in the SMBIOS.
We don't want a pre-created root user, this prevents us from overriding
the root password via the
io.systemd.credential:passwd.plaintext-password.root
credential that
we can set in the SMBIOS.