Merge "allocateSpaceForUpdate: clear calling identity before calling into apexd." into sc-dev am: 4db95cce am: 76b7c681

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15028970

Change-Id: I4fcf135127a4927c95cdda7a3e9f1fbdb0e9950c