Merge "Define a backing type for ADataSpace." into main am: 72d92efc71 am: 88127a1114

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

Change-Id: I7af6166c94b5fc4c11712f459813a2b9aec239eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>