crypto: hisilicon/sec2 - fix for aead authsize alignment

The hardware only supports authentication sizes
that are 4-byte aligned. Therefore, the driver
switches to software computation in this case.

Fixes: 2f072d75 ("crypto: hisilicon - Add aead support on SEC2")
Signed-off-by: Wenkai Lin <linwenkai6@hisilicon.com>
Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>