Test failing raw_key_agreement in ssl mock tests

Force a bitflip in server key to make the raw key
agreement fail, and then verify that no key slots
are left open at the end. Use a Weierstrass curve
to have a high chance of failure upon encountering
such bitflip.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index b9cad6a..715e653 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -3360,3 +3360,6 @@
 
 Sanity test cid functions
 cid_sanity:
+
+Raw key agreement fail
+raw_key_agreement_fail: