dnsmasq: switch to ubus-based hotplug call

Use new ubus-based hotplug call in dhcp-script.sh
As sysntpd now makes use of the new ubus-based hotplug calls, dnsmasq
no longer needs to ship ACL to cover ntpd-hotplug.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/network/services/dnsmasq/files/dnsmasq_acl.json

@@ -1,4 +1,12 @@
 {
 	"user": "dnsmasq",
-	"publish": [ "dnsmasq" ]
+	"publish": [ "dnsmasq" ],
+	"access": {
+		"hotplug.dhcp": {
+			"methods": [ "call" ]
+		},
+		"hotplug.neigh": {
+			"methods": [ "call" ]
+		}
+	}
 }