Add missing include to support new toolchain settings

Author: troelsjessen

src/crypto/crypto.c

@@ -3,6 +3,7 @@
 #include <csp/arch/csp_time.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #ifdef USE_TWEETNACL
 #include "tweetnacl.h"

src/csp_if_cblk.c

@@ -2,6 +2,7 @@
 
 #include <stdio.h>
 #include <endian.h>
+#include <string.h>
 #include <csp/crypto/csp_hmac.h>
 #include <csp/csp_id.h>
 #include <csp/csp_iflist.h>