Merge "Hide power menu Emergency button if device lacks telephony" into tm-dev...

Merge "Hide power menu Emergency button if device lacks telephony" into tm-dev am: 55940dd7 am: e8c15a1f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17109658

Change-Id: Ibc014ae72a8c3cb51f8453194a8966a39a614676