Add crypto-policies to tmpfiles

Among other things, this is needed for `systemd-resolved` to work on
Fedora.

Author: davide125

mkosi.extra/usr/lib/tmpfiles.d/etc.conf

@@ -16,6 +16,7 @@ L? /etc/bash.bashrc
 L? /etc/bash.bash_logout
 # Canonical location to look for certificates
 L? /etc/ca-certificates
+L? /etc/crypto-policies
 L? /etc/pki
 L /etc/debuginfod
 L /etc/ssh/ssh_config