SUNRPC: Advertise support for the Camellia encryption types

Add the RFC 6803 encryption types to the string of integers that is
reported to gssd during upcalls. This enables gssd to utilize keys
with these encryption types when support for them is built into the
kernel.

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