Merge "Add implementation for unimplemented APIs and add description for return value" am: bed02b07 am: 1f678716 am: b5044c06 am: 7dbddbdc am: 6b2c88be

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2006753

Change-Id: I24a744a089fae65a67f03cfa8bd219b4401f0308