SUNRPC: Add gk5e definitions for RFC 8009 encryption types

Fill in entries in the supported_gss_krb5_enctypes array for the
encryption types defined in RFC 8009. These new enctypes use the
SHA-256 and SHA-384 message digest algorithms (as defined in
FIPS-180) instead of the deprecated SHA-1 algorithm, and are thus
more secure.

Note that NIST has scheduled SHA-1 for deprecation:

https://www.nist.gov/news-events/news/2022/12/nist-retires-sha-1-cryptographic-algorithm

Thus these new encryption types are placed under a separate CONFIG
option to enable distributors to separately introduce support for
the AES-SHA2 enctypes and deprecate support for the current set of
AES-SHA1 encryption types as their user space allows.

As this implementation is still a "beta", the default is to not
build it automatically.

Tested-by: Scott Mayhew <smayhew@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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