tls13: Use MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED

Use MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED
instead of MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED to guard
code specific to the TLS 1.3 ephemeral key exchange mode.

Use it also for the dependencies of TLS 1.3 only tests
relying on ephemeral key exchange mode, but for
tests in tls13-kex-modes.sh where the change is done
later using all
MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_.*ENABLED macros.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index c130e53..a35762d 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -261,7 +261,7 @@
 handshake_version:0:MBEDTLS_SSL_VERSION_TLS1_2:MBEDTLS_SSL_VERSION_TLS1_2:MBEDTLS_SSL_VERSION_TLS1_2:MBEDTLS_SSL_VERSION_TLS1_2:MBEDTLS_SSL_VERSION_TLS1_2
 
 Handshake, tls1_3
-depends_on:MBEDTLS_SSL_PROTO_TLS1_3:!MBEDTLS_SSL_PROTO_TLS1_2:MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED
+depends_on:MBEDTLS_SSL_PROTO_TLS1_3:!MBEDTLS_SSL_PROTO_TLS1_2:MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED
 handshake_version:0:MBEDTLS_SSL_VERSION_TLS1_3:MBEDTLS_SSL_VERSION_TLS1_3:MBEDTLS_SSL_VERSION_TLS1_3:MBEDTLS_SSL_VERSION_TLS1_3:MBEDTLS_SSL_VERSION_TLS1_3
 
 Handshake, ECDHE-RSA-WITH-AES-256-GCM-SHA384