Merge "gtbs: Add Generic Telephone Bearer Service support" am: ddcee937c1 am: 66a9d57579 am: 8ef0cb74f7

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1942955

Change-Id: I42f0e6c218a33e642207b46bc58a1b53cb6eee2a