dnsmasq: provide the ntp server running on the idu to the dhcp clients

Fixes: SYS#1180

recipes-extra/dnsmasq/files/sysmocom-idu/dnsmasq.conf

@@ -147,6 +147,9 @@ dhcp-range=wifi-admin,172.16.8.10,172.16.8.254,255.255.255.0,24h
 dhcp-range=wifi-onboard,172.16.128.10,172.16.131.254,255.255.252.0,24h
 dhcp-range=wifi-remote,172.16.132.10,172.16.135.254,255.255.252.0,24h
 
+# provide the ntp server running on the idu
+dhcp-option=option:ntp-server,0.0.0.0
+
 # This is an example of a DHCP range with a network-id, so that
 # some DHCP options may be set only for this network.
 #dhcp-range=red,192.168.0.50,192.168.0.150
@@ -228,9 +231,6 @@ dhcp-range=wifi-remote,172.16.132.10,172.16.135.254,255.255.252.0,24h
 # DNS server - 6
 # broadcast address - 28
 
-# Set the NTP time server addresses to 172.16.1.1
-dhcp-option=42,172.16.1.1
-
 # Set the NTP time server address to be the same machine as 
 # is running dnsmasq
 #dhcp-option=42,0.0.0.0