ethernet_interface: Remove DHCP from constructor

It should be set or configured just like all other parameters.

Change-Id: Ic93de4e80b4da0de2e97b9655c424fa55a6844bf
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/mock_network_manager.hpp b/test/mock_network_manager.hpp
index 46c7c4b..fde3bbd 100644
--- a/test/mock_network_manager.hpp
+++ b/test/mock_network_manager.hpp
@@ -34,8 +34,7 @@
             config::Parser config(config::pathForIntfConf(confDir, interface));
             auto intf =
                 std::make_shared<phosphor::network::MockEthernetInterface>(
-                    bus, objPath.string(), config, getDHCPValue(config), *this,
-                    true);
+                    bus, objPath.string(), config, *this, true);
             intf->createIPAddressObjects();
             intf->createStaticNeighborObjects();
             intf->loadNameServers(config);