Merge "gtbs: Add Generic Telephone Bearer Service support" am: cb64b957f7 am: c245603eab am: 3bcdbfb925 am: 3e1a493f6e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1873900

Change-Id: I719487c08ddb419f1a9eb3d02771a082a2a59902