Add not exported flag to affected runtime receiver am: bf923878

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



Change-Id: I823c57b06078ae8d322e950e556d4cb47b83e62d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>