Add not exported flag to affected runtime receiver am: bf923878 am: 4f569245

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/2270166



Change-Id: Iccb7b2aa7d3edaf83ba380965545ca5a8a0ea9d6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>