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/nic_mock.cpp b/subprojects/ncsid/test/nic_mock.cpp
index c435ffa..20f7f56 100644
--- a/subprojects/ncsid/test/nic_mock.cpp
+++ b/subprojects/ncsid/test/nic_mock.cpp
@@ -15,9 +15,11 @@
 #include "nic_mock.h"
 
 #include "platforms/nemora/portable/ncsi.h"
+#include "platforms/nemora/portable/ncsi_server.h"
 
 #include <algorithm>
 #include <cstddef>
+#include <cstring>
 #include <stdexcept>
 
 namespace mock