MBEDTLS_SSL_MAX_EARLY_DATA_SIZE: default value should be commented out in config

Numeric options should be commented out with their default values in the config
file, and a separate header file should set the default value if necessary.
This was done for most other options in #8161; do it here for
MBEDTLS_SSL_MAX_EARLY_DATA_SIZE.

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index a3ecbfb..d6083da 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -405,6 +405,10 @@
 #define MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY 16
 #endif
 
+#if !defined(MBEDTLS_SSL_MAX_EARLY_DATA_SIZE)
+#define MBEDTLS_SSL_MAX_EARLY_DATA_SIZE        1024
+#endif
+
 #if !defined(MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE)
 #define MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE 6000
 #endif