Remove useless early data related macros for the time being

Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 8e45726..9480de0 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1635,8 +1635,11 @@
 /**
 * \def MBEDTLS_SSL_EARLY_DATA
 *
-* Allows to add functionality for TLS/DTLS 1.3 early data.
+* Enable support for RFC 8446 TLS 1.3 early data.
 *
+* Requires: MBEDTLS_SSL_PROTO_TLS1_3
+*
+* Comment this to disable support for early data.
 */
 //#define MBEDTLS_SSL_EARLY_DATA