clang-tidy: Fix modernize-deprecated-headers diagnostic
For example:
```
/mnt/host/andrew/src/openbmc/libpldm/build/../tests/libpldm_bios_test.cpp:2:10: error: inclusion of deprecated C++ header 'stdint.h'; consider using 'cstdint' instead [modernize-deprecated-headers,-warnings-as-errors]
^~~~~~~~~~
<cstdint>
```
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ifebba7d7c21cc60a389a8783361fc23226135ee0
diff --git a/tests/libpldm_pdr_test.cpp b/tests/libpldm_pdr_test.cpp
index 2af2c34..6b99d5e 100644
--- a/tests/libpldm_pdr_test.cpp
+++ b/tests/libpldm_pdr_test.cpp
@@ -1,9 +1,9 @@
#include <endian.h>
-#include <stdlib.h>
-#include <string.h>
#include <array>
#include <cstdint>
+#include <cstdlib>
+#include <cstring>
#include <vector>
#include "libpldm/pdr.h"