fix hwaes buffers alignment

hwaes.EncryptionDecryptionCBCNoSHM maps text_in and text_out
buffers directly to req and resp messages body,
so we need to make sure that the message itself is aligned
and offset of text_in and text_out in the message are
also aligned. Add padding before text offset if necessary.

Change-Id: Ia503416d27b781c2b73162cb3499603d23757054
Bug: 286029819
Test: trusty.hwaes.test
5 files changed