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: Iec38ad09c3fc7049459da25b0cd15d14e2e9e24f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>