Simplify entropy seed injection configuration

Move NVSEED callbacks configuration to a header file

Author: alzix

features/mbedtls/platform/inc/platform_mbed.h

@@ -21,10 +21,20 @@
 #ifndef __PLATFORM_MBED__H__
 #define __PLATFORM_MBED__H__
 
-#if defined(TARGET_PSA)
+#if (defined(TARGET_PSA) && defined(MBEDTLS_ENTROPY_NV_SEED))
+
 #include "default_random_seed.h"
+
+#if !defined(MBEDTLS_PLATFORM_NV_SEED_READ_MACRO)
+#define MBEDTLS_PLATFORM_NV_SEED_READ_MACRO mbed_default_seed_read
 #endif
 
+#if !defined(MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO)
+#define MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO mbed_default_seed_write
+#endif
+
+#endif  // (defined(TARGET_PSA) && defined(MBEDTLS_ENTROPY_NV_SEED))
+
 #if DEVICE_TRNG
 #define MBEDTLS_ENTROPY_HARDWARE_ALT
 #endif

targets/targets.json

@@ -7904,9 +7904,7 @@
             "PSOC6_DYNSRM_DISABLE=1",
             "MBEDTLS_PSA_CRYPTO_SPM",
             "MBEDTLS_PSA_CRYPTO_C",
-            "MBEDTLS_ENTROPY_NV_SEED",
-            "MBEDTLS_PLATFORM_NV_SEED_READ_MACRO=mbed_default_seed_read",
-            "MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO=mbed_default_seed_write"
+            "MBEDTLS_ENTROPY_NV_SEED"
         ],
         "deliver_to_target": "FUTURE_SEQUANA_PSA",
         "overrides": {