Revert "The EVP_MAC functions have been renamed for consistency. The EVP_MAC_CTX_*"

Revert "The EVP_MAC functions have been renamed for consistency.  The EVP_MAC_CTX_*"

The commit claimed to make things more consistent. In fact it makes it
less so. Revert back to the previous namig convention.

This reverts commit d9c2fd51e2e278bc3f7793a104ff7b4879f6d63a.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12186)