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: I0b62ccca7063d4467779d00513097a072a87382e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>