Add common header for crypto service integration
diff --git a/library/psa_crypto_storage_its.c b/library/psa_crypto_storage_its.c
index 4f67016..d939f0d 100644
--- a/library/psa_crypto_storage_its.c
+++ b/library/psa_crypto_storage_its.c
@@ -26,22 +26,9 @@
#endif
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C)
-/*
- * When MBEDTLS_PSA_CRYPTO_SPM is defined, the code is being built for SPM
- * (Secure Partition Manager) integration which separates the code into two
- * parts: NSPE (Non-Secure Processing Environment) and SPE (Secure Processing
- * Environment). When building for the SPE, an additional header file should be
- * included.
- */
-#if defined(MBEDTLS_PSA_CRYPTO_SPM)
-/*
- * PSA_CRYPTO_SECURE means that this file is compiled for the SPE.
- * Some headers will be affected by this flag.
- */
-#define PSA_CRYPTO_SECURE 1
-#endif
#include "psa/error.h"
+#include "psa_crypto_service_integration.h"
#include "psa/crypto.h"
#include "psa_crypto_storage_backend.h"
#include "psa/internal_trusted_storage.h"