Merge "Only allow the system server to connect to sync adapters" into qt-dev...

Merge "Only allow the system server to connect to sync adapters" into qt-dev am: 99ccb4e5 am: 822fbf61

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18701369



Change-Id: I19750ed605001905eee78852893d1b18e8f274bb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>