Merge "Make receiver as system user only" into main am: 4146003c0f

Original change: https://android-review.googlesource.com/c/platform/packages/services/AlternativeNetworkAccess/+/2855685

Change-Id: I405661faa903fa6bf85456c18102f40900a9f923
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>