CipherTest: test instance reuse with updateAAD

AAD was not being reset on each Cipher init or doFinal call, so add
regression tests to make sure that is now the case.

(cherry picked from commit d90a44bf4956d335e2a876015cf258dc46e226ea)

Bug: 27324690
Change-Id: I5f7606efb6dfcd412166eed2bd5f417097a97f1f
1 file changed