Merge "Hide lockscreen Emergency button if device lacks telephony" into tm-dev am: ddd56e4b am: db3b2fa6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17089038

Change-Id: Ibf0075cb565bacbdf1416d1b8b9607a18f4f4dcc