Merge "Handle case where NN AIDL callback is null in IDevice::prepareModel*" into tm-dev am: 9265715fc7 am: a29f5cc5de

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/18102697

Change-Id: I570a47f319851c71fa5bef82ba1adb17d0894afc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>