Keep exposing the library common.h in test/macros.h

Partially revert "Give test code access to internal macros of the library".
I think that it would be better not to require every user of `test/macros.h`
to have access to the library source, but it's out of scope here.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/include/test/macros.h

@@ -22,6 +22,12 @@
 #include "mbedtls/memory_buffer_alloc.h"
 #endif
 
+#if defined(TF_PSA_CRYPTO_VERSION_NUMBER)
+#include "tf_psa_crypto_common.h"
+#else
+#include "common.h"
+#endif
+
 /**
  * \brief   This macro tests the expression passed to it as a test step or
  *          individual test in a test case.