Fix minor TODOs in HIDL-AIDL translation shim am: 9c922979d2 am: edd5a0b119 am: fe0b32992f

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1937405

Change-Id: Ie15967c699e0f0bb6eb20c8bdbd42021130e87c0