Fix updateAAD when offset is not 0

Due to AAD data not being reset when a Cipher instance was re-used, this
bug was never uncovered by tests that actually exercise this case.

(cherry picked from commit 95cf7b9b7fbabb77cd341f17da79c947bcc934ab)

Bug: 27696681
Bug: 27324690
Change-Id: Iae9b5794f212a8fc4eeff2a651332e7490f5cada
