Merge "Do not send and receive datagrams at the same time." into udc-dev am: 3dd7975a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/22579380



Change-Id: I3dbec1b970f627dcde8e26ab83f58d269286486f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>