x509 tests: adjust dependencies

*** Comparing before-default -> after-default ***
   x509parse: total 723; skipped  26 ->  26
   x509write: total  41; skipped   8 ->   8

*** Comparing before-full -> after-full ***
   x509parse: total 723; skipped  25 ->  25
   x509write: total  41; skipped   0 ->   0

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index d63fa35..7fe48f2 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -7,6 +7,7 @@
 #include "mbedtls/rsa.h"
 
 #include "hash_info.h"
+#include "legacy_or_psa.h"
 
 #if defined(MBEDTLS_RSA_C)
 int mbedtls_rsa_decrypt_func( void *ctx, size_t *olen,