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

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

Change-Id: Ice0be1d2eb0476dae338add03c5264c9ddd08626