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

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

Change-Id: I2ad007b8a4e6920fb69fc7af16b9e67ec5b2f476