le_audio: Implement active device handling

This is needed to set LE audio device representig this group as active.

Tag: #feature
Test: Set LE audio device as active
Sponsor: jpawlowski@
Bug: 150670922
Merged-In: I09164219027c2c31f55912a1687be1d654430c2f
Change-Id: I09164219027c2c31f55912a1687be1d654430c2f
4 files changed
tree: 48a108bf60bf4b34c357d17a73324365c3385013
  1. android/