Merge "Add action for Bluetooth tethering state changed" am: cf44a015e8 am: 773810d198 am: f03a18b7ab am: eca1afc382

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1422889

Change-Id: Ia9e532d720f6cdd969bcb0fd5beda0a8a8866c3f