ssl-opt.sh: Fix dependency on ECDSA

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 140409c..a90d5af 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -2373,7 +2373,7 @@
             -C "error"
 
 requires_config_enabled MBEDTLS_X509_CRT_PARSE_C
-requires_config_enabled MBEDTLS_ECDSA_C
+requires_config_enabled PSA_WANT_ALG_ECDSA
 requires_config_enabled PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC
 requires_config_disabled MBEDTLS_SSL_ASYNC_PRIVATE
 requires_hash_alg SHA_256