crypto: talitos - check AES key size

commit 1ba34e71

 upstream.

Although the HW accepts any size and silently truncates
it to the correct length, the extra tests expects EINVAL
to be returned when the key size is not valid.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Fixes: 4de9d0b5

 ("crypto: talitos - Add ablkcipher algorithms")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[bwh: Backported to 3.16: only cbc(aes) algorithm is supported]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>