iwyu: Cleanup include headers

Triggered iwyu and add/remove used headers.

Change-Id: Iadbdb459563b3c89baf2d56f90a540342d020cd5
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/subprojects/ncsid/test/net_iface_mock.cpp b/subprojects/ncsid/test/net_iface_mock.cpp
index 4b071ed..5e2d223 100644
--- a/subprojects/ncsid/test/net_iface_mock.cpp
+++ b/subprojects/ncsid/test/net_iface_mock.cpp
@@ -14,6 +14,9 @@
 
 #include "net_iface_mock.h"
 
+#include <linux/if.h>
+#include <sys/ioctl.h>
+
 namespace mock
 {