test_suite_debug: adapt dependenies so the test can run in the driver-only build

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index fa93ca9..85544b5 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -1,6 +1,7 @@
 /* BEGIN_HEADER */
 #include "mbedtls/debug.h"
 #include "string.h"
+#include "mbedtls/legacy_or_psa.h"
 
 struct buffer_data
 {