systemd-conf: Remove unwanted default network config

This configs are enabling DHCP by default on eth0.
We handle all network configurations directly in NetworkManager.

BugzID: 69636

recipes-core/systemd/systemd-conf_%.bbappend

@@ -11,4 +11,7 @@ do_install_append() {
 
     install -d ${D}${sysconfdir}/systemd
     install -m 644 ${WORKDIR}/journald.conf ${D}${sysconfdir}/systemd
+
+    # Remove default network configurations
+    rm -rf ${D}${systemd_unitdir}/network
 }