psa: Explicitly include platform_util.h
crypto_extra.h has a dependency on platform_util.h for
MBEDTLS_DEPRECATED_NUMERIC_CONSTANT. Make the dependency explicit by
including platform_util.h. Although in most use cases the header should
already be included by something else, it doesn't hurt to include it
again and helps to clarify dependencies.
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index 86d9954..5dd4789 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -30,6 +30,8 @@
#ifndef PSA_CRYPTO_EXTRA_H
#define PSA_CRYPTO_EXTRA_H
+#include "mbedtls/platform_util.h"
+
#ifdef __cplusplus
extern "C" {
#endif