Merge "Define a backing type for ADataSpace." into main am: 72d92efc71

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2902242

Change-Id: Icedf73d04ba11a7106f1f50b5cb92b155652d7c7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>