Use SSL_early_data_reason_string in EarlyDataReasonToString.
Use SSL_early_data_reason_string in EarlyDataReasonToString.

ssl_early_data_reason_t is an extensible enum. Maintaining a switch-case in
QUICHE means compile failures and general churn when BoringSSL adds new values,
switch to the newly-added SSL_early_data_reason_string function.

This is gated by a BORINGSSL_API_VERSION preprocessor check to smooth the
landing between downstream repositories. (QUICHE is incompatible with BoringSSL
HEAD due to the addition of ssl_early_data_reason_alps. This CL unblocks the
update.)

Once https://boringssl-review.googlesource.com/c/boringssl/+/43724 has rolled
into all downstream repositories, we can remove the preprocessor check.

PiperOrigin-RevId: 340322863
Change-Id: Ie139b5515ac2bc50f21c7cf682fa0f1a3993fd82

google/quiche,google/quiche,google/quiche,google/quiche