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

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

Change-Id: I8beaacdd02aac61c7bdcb613e13e1dea4a9beb20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>