cipher:kyber: Constants common and k-dependent.
* cipher/kyber.c (KYBER_ETA1): Remove. (KYBER_ETA1_2, KYBER_ETA1_3_4): New. (KYBER_POLYCOMPRESSEDBYTES): Remove. (KYBER_POLYCOMPRESSEDBYTES_2_3): New. (KYBER_POLYCOMPRESSEDBYTES_4): New.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>