crypto: starfive - Pad adata with zeroes

crypto: starfive - Pad adata with zeroes

Aad requires padding with zeroes up to 15 bytes in some cases. This
patch increases the allocated buffer size for aad and prevents the
driver accessing uninitialized memory region.

v1->v2: Specify reason for alloc size change in descriptions.

Signed-off-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from mainline commit 8a0d929b53c383ba678ed65742e4a8982f71d5c0)
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Change-Id: I4d74dc9ce42516838cee07d039a3f13f457e5336