crypto: ccree - don't mangle the request assoclen

[ Upstream commit da3cf67f1bcf25b069a54ff70fd108860242c8f7 ]

We were mangling the request struct assoclen field.
Fix it by keeping an internal version and working on it.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>