Implement PSA ITS over files

Implement the PSA ITS API over stdio files.
diff --git a/programs/test/query_config.c b/programs/test/query_config.c
index 345d1ec..7993be6 100644
--- a/programs/test/query_config.c
+++ b/programs/test/query_config.c
@@ -1962,6 +1962,14 @@
     }
 #endif /* MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C */
 
+#if defined(MBEDTLS_PSA_ITS_FILE_C)
+    if( strcmp( "MBEDTLS_PSA_ITS_FILE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_PSA_ITS_FILE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_PSA_ITS_FILE_C */
+
 #if defined(MBEDTLS_RIPEMD160_C)
     if( strcmp( "MBEDTLS_RIPEMD160_C", config ) == 0 )
     {