Remove useless early data related macros for the time being

Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 5f89593..976a134 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1084,7 +1084,7 @@
 void mbedtls_ssl_conf_early_data( mbedtls_ssl_config *conf,
                                   int early_data_enabled )
 {
-    conf->early_data_enabled = early_data;
+    conf->early_data_enabled = early_data_enabled;
 }
 #endif /* MBEDTLS_SSL_EARLY_DATA */