[refactoring] Rename AeadCtx to AeadContext to enhance readability am: 78b35f84ab am: 4175244bab

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

Change-Id: I47355303d0aeade27c8f50a7e84927f78043d0a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>