g10: Fix symmetric cipher algo constant for ECDH.
* g10/ecdh.c (kek_params_table): Use CIPHER_ALGO_AES192 for ECC strength 384, according to RFC-6637.
(cherry picked from commit af3efd149f555d36a455cb2ea311ff81caf5124c)
- Reported-by: Trevor Bentley
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>