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

The EVP_MAC functions have been renamed for consistency.  The EVP_MAC_CTX_*
functions are now EVP_MAC functions, usually with ctx in their names.

Before 3.0 is released, the names are mutable and this prevents more
inconsistencies being introduced.

There are no functional or code changes.
Just the renaming and a little reformatting.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11997)