Merge "Add hidden API to support allowed networks reason" into rvc-dev am: 8d26aeb27f am: d5998c33b0

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/11715884

Change-Id: If842bb009012d16aa94bbd5ee6312a773e4e61d4