Fix race condition in data network am: 60627011

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/17773765



Change-Id: I8c23fb74a92740b270e1552c0c619a18651adb43
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>