Add missing string header for memcpy

Fix compile error: ‘memcpy’ was not declared

Change-Id: I54d1849a3a18901baac1e24986b82067eb2fd6b4

src/rocm_smi_gpu_metrics.cc

@@ -53,6 +53,7 @@
 #include <regex>  // NOLINT
 #include <vector>
 #include <pthread.h>
+#include <string.h>
 
 #include "rocm_smi/rocm_smi_common.h"  // Should go before rocm_smi.h
 #include "rocm_smi/rocm_smi_main.h"