Include ssl_misc.h for additional SSL helper files

This commit replaces #include "common.h" in favour of #include
"ssl_misc.h".

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/library/mps_trace.h b/library/mps_trace.h
index b456b2f..ac2b75f 100644
--- a/library/mps_trace.h
+++ b/library/mps_trace.h
@@ -12,7 +12,7 @@
 #ifndef MBEDTLS_MPS_MBEDTLS_MPS_TRACE_H
 #define MBEDTLS_MPS_MBEDTLS_MPS_TRACE_H
 
-#include "common.h"
+#include "ssl_misc.h"
 #include "mps_common.h"
 #include "mps_trace.h"