Merge "Add missing synchronized(mLock) blocks into PackageManagerService" into rvc-qpr-dev am: 83462e4f8e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12453453

Change-Id: I6f696ce8044a9d3518e5a5117f35b62c1a805b30