treewide: Cleanup unused includes

Change-Id: Ied2a0d97d2c31dc2b370452768a7f41d9ecf07f3
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/network_manager_main.cpp b/src/network_manager_main.cpp
index fa4efe5..6a9c740 100644
--- a/src/network_manager_main.cpp
+++ b/src/network_manager_main.cpp
@@ -3,6 +3,9 @@
 #include "network_manager.hpp"
 #include "rtnetlink_server.hpp"
 #include "types.hpp"
+#ifdef SYNC_MAC_FROM_INVENTORY
+#include "util.hpp"
+#endif
 
 #include <linux/netlink.h>