Unhide BluetoothProfile.LE_AUDIO and getGroupId for the App usage.

This change contains two item,
1. public BluetoothProfile.LE_AUDIO that App can use
BluetoothProfile.ServiceLister with LE Audio profile, such as HFP, A2DP
and hearing aid profile.
2. public getGroupId API that App can use this api to identify which
devices are in the same group

Bug: 150670922
Test: Manual test
Change-Id: I32865720a8195b7c5ae29411cd1f3de95e7fc9b5
Merged-In: I32865720a8195b7c5ae29411cd1f3de95e7fc9b5