Add SeqNum as an the external_aad in CryptoPayload am: 73f66600e9 am: 27f472d5ad

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2876314

Change-Id: I5a1dd0a2a376efdb1509e9dfb697174b8f90e366
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>