modules: mbedtls: fix ITS configuration on POSIX architecture

Make sure that `MBEDTLS_PSA_ITS_FILE_C` is not defined when
`CONFIG_SECURE_STORAGE` is enabled as the former takes precedence over
the latter in Mbed TLS (`psa_crypto_storage.c`).

This fixes usage of the secure storage subsystem by Mbed TLS on platforms
such as `native_sim`.

Signed-off-by: Tomi Fontanilles <[email protected]>

Author: tomi-font

modules/mbedtls/configs/config-tls-generic.h

@@ -482,12 +482,13 @@
 #define MBEDTLS_PSA_P256M_DRIVER_ENABLED
 #endif
 
-#if defined(CONFIG_ARCH_POSIX) && !defined(CONFIG_PICOLIBC)
+#if defined(CONFIG_ARCH_POSIX) && !defined(CONFIG_PICOLIBC) && !defined(CONFIG_SECURE_STORAGE)
 #define MBEDTLS_PSA_ITS_FILE_C
+#define MBEDTLS_PSA_CRYPTO_STORAGE_C
 #define MBEDTLS_FS_IO
 #endif
 
-#if defined(CONFIG_SECURE_STORAGE) || (defined(CONFIG_ARCH_POSIX) && !defined(CONFIG_PICOLIBC))
+#if defined(CONFIG_SECURE_STORAGE)
 #define MBEDTLS_PSA_CRYPTO_STORAGE_C
 #endif