Merge "Add placeholder for types generated from AIDL" am: eb9bee159f am: 13ab0f6d99 am: 1c74e071f1

Original change: https://android-review.googlesource.com/c/platform/system/security/+/1387137

Change-Id: I5f9f562e215f102eba96d16e4a6c411a184adb5d