Merge "Use new bluetooth API to enable/disable bt tethering after T" am: ceeebae37e am: 3f6131687b am: 0842fc9c14 am: 1a488511c8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1760685

Change-Id: I72a9ff00f5b54508f315984dd0fead39e3b38d5a