Rename internal header constant_time.h to constant_time_internal.h

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 6b3658f..8ac2af1 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -10,7 +10,7 @@
 
 #include <psa/crypto.h>
 
-#include <constant_time.h>
+#include <constant_time_internal.h>
 
 #include <test/constant_flow.h>