Satellite demo mode : Simulated sending and receiving am: b6c01756 am: 3978c467

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



Change-Id: If200d5c83860a2c3f3bcc6c4766fd952293fb49e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>