cryptodev: revert Chacha20-Poly1305 AEAD algorithm

cryptodev: revert Chacha20-Poly1305 AEAD algorithm

API makes think that rte_cryptodev_info_get() cannot return
a value >= 3 (RTE_CRYPTO_AEAD_LIST_END in 19.11).
20.02-rc1 was returning 3 (RTE_CRYPTO_AEAD_CHACHA20_POLY1305).
So the ABI compatibility contract was broken.

It could be solved with some function versioning,
but because a lack of time, the feature is reverted for now.

This reverts following commits:
- 6c9f3b347e21 ("cryptodev: add Chacha20-Poly1305 AEAD algorithm")
- 2c512e64d600 ("crypto/qat: support Chacha Poly")
- d55e01f579e1 ("test/crypto: add Chacha Poly cases")

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>