Merge "libbinder_ndk: Add default constructor for SpAIBinder" am: b599a473bb am: f27ee62115 am: 451f45e478

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1449267

Change-Id: Ib5416f8d2425a4ab8a1180e2bf0d6ec56eb15bea