Satellite demo mode : Simulated sending and receiving am: b6c01756 am: 3ea8fa37

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/22840005



Change-Id: I3f3d0bbca541ac440561e64d110088e1171413ec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>