UPSTREAM: crypto: blake2b - delete unused structs or members

All the code for param block has been inlined, last_node and outlen from
the state are not used or have become redundant due to other code.
Remove it.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

(cherry picked from commit d063d6327e7de18e16e4742579a0ff759c3889fb)
Bug: 178411248
Change-Id: Ia7090fe3162495abae29b86f37e53ebf02414fe2
Signed-off-by: Eric Biggers <ebiggers@google.com>