Merge "New property to control virtual a/b user-space snapshots" am: b295d44694 am: ec750298c3 am: 328ce9cccb

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/1885106

Change-Id: Ib77dd526257fa5b399adeaccd3cc412e916a36c6