Fill in alg_bits for CHACHA20_POLY1305 ciphers.

Apparently we left those as zero. Oh well. This only affects
SSL_CIPHER_get_bits, but so long as we have the field, it ought to be correct.

Change-Id: I2878ec22c2f5a6263f805e04d9fd8448994639b7
Reviewed-on: https://boringssl-review.googlesource.com/5752
Reviewed-by: Adam Langley <agl@google.com>

ssl/ssl_cipher.c

diff --git a/ssl/ssl_cipher.c b/ssl/ssl_cipher.c
index e697a57..551cc52 100644
--- a/ssl/ssl_cipher.c
+++ b/ssl/ssl_cipher.c
@@ -447,7 +447,7 @@
      TLS1_CK_ECDHE_RSA_CHACHA20_POLY1305, SSL_kECDHE, SSL_aRSA,
      SSL_CHACHA20POLY1305, SSL_AEAD, SSL_TLSV1_2, SSL_HIGH,
      SSL_HANDSHAKE_MAC_SHA256,
-     256, 0,
+     256, 256,
     },
 
     {
@@ -455,7 +455,7 @@
      TLS1_CK_ECDHE_ECDSA_CHACHA20_POLY1305, SSL_kECDHE, SSL_aECDSA,
      SSL_CHACHA20POLY1305, SSL_AEAD, SSL_TLSV1_2, SSL_HIGH,
      SSL_HANDSHAKE_MAC_SHA256,
-     256, 0,
+     256, 256,
     },
 };