[refactoring] Rename AeadCtx to AeadContext to enhance readability am: 78b35f84ab am: 4175244bab am: 299310bb21 am: 88188c6d95

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2775449

Change-Id: I07602a023f85dda00bb6846d4b41b5d395f35903
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>