crypto: cavium/nitrox - check assoclen and authsize for gcm(aes) cipher

Check if device supports assoclen to solve hung task timeout error when
extra tests are enabled. Return -EINVAL if assoclen is not supported.
Check authsize to return -EINVAL if authentication tag size is invalid.
Change blocksize to 1 to match with generic implementation.

Signed-off-by: Nagadheeraj Rottela <rnagadheeraj@marvell.com>
Reported-by: Mallesham Jatharakonda <mallesham.jatharakonda@oneconvergence.com>
Suggested-by: Mallesham Jatharakonda <mallesham.jatharakonda@oneconvergence.com>
Reviewed-by: Srikanth Jampala <jsrikanth@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>