hyp_ethernet_interface: add missing header

There was an assumption that an sdbus++ header file was implicitly
included, but the generated files are changing.  Explicitly add that
header.

Change-Id: I48519bfe5e07d648c26c339f8b59d6a70ee9f997
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/src/ibm/hypervisor-network-mgr-src/hyp_ethernet_interface.hpp b/src/ibm/hypervisor-network-mgr-src/hyp_ethernet_interface.hpp
index b4d0788..c89d3cd 100644
--- a/src/ibm/hypervisor-network-mgr-src/hyp_ethernet_interface.hpp
+++ b/src/ibm/hypervisor-network-mgr-src/hyp_ethernet_interface.hpp
@@ -9,6 +9,7 @@
 #include <sdbusplus/bus.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 #include <xyz/openbmc_project/Network/EthernetInterface/server.hpp>
+#include <xyz/openbmc_project/Network/IP/server.hpp>
 
 namespace phosphor
 {