Merge "Do not process messages until new messages are feeding" am: 8cb9c78a4d

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1535591

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9e0705e0fe676dc92f1e9ba15cbc496e215a2691