GH815: The ChaCha20/Poly1305 codepoints are official

CCA8, CCA9, CCAA, CCAB, CCAC, CCAD, and CCAE are now present in
https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml


so remove the "as per draft-ietf-tls-chacha20-poly1305-03" note
accordingly.

Signed-off-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>