Remove `MBEDTLS_KEY_EXCHANGE_RSA_ENABLED` config option

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 6a5e760..7692017 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -311,8 +311,7 @@
     SKIP_NEXT="YES"
 }
 
-TLS1_2_KEY_EXCHANGES_WITH_CERT="MBEDTLS_KEY_EXCHANGE_RSA_ENABLED \
-                                MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \
+TLS1_2_KEY_EXCHANGES_WITH_CERT="MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \
                                 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \
                                 MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED \
                                 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED"
@@ -320,9 +319,8 @@
 TLS1_2_KEY_EXCHANGES_WITH_ECDSA_CERT="MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED \
                                       MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED"
 
-TLS1_2_KEY_EXCHANGES_WITH_CERT_WO_ECDH="MBEDTLS_KEY_EXCHANGE_RSA_ENABLED \
-                                       MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \
-                                       MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED"
+TLS1_2_KEY_EXCHANGES_WITH_CERT_WO_ECDH="MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED \
+                                        MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED"
 
 requires_certificate_authentication () {
     if is_config_enabled MBEDTLS_SSL_PROTO_TLS1_3