Add tls CID tests

Add tests to test tls coneection id functionality, including the new
'own cid' accessor.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index 7de562a..9f47aba 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -3213,3 +3213,6 @@
 
 Test accessor into timing_delay_context
 timing_final_delay_accessor
+
+Sanity test cid functions
+cid_sanity: