ntp: do not use bindaddress
because it only bound to 127.0.0.1 as documented in
https://chrony.tuxfamily.org/doc/3.2/chrony.conf.html#bindaddress
Currently, for each of the IPv4 and IPv6 protocols, only one bindaddress
directive can be specified. Therefore, it is not useful on computers
which should serve NTP on multiple network interfaces.
Access control is still provided through the allow directives
which deny access from the Internet
Fixes https://progress.opensuse.org/issues/38918