BleAudioVolume: Fix calculation for the activated device

Fixes the following:
 - invalid volume level value set for the newly activated BLE device
   (additional patch for Bluetooth is also provided)
 - audio FW not being notified about the new volume level when
   switching to phone call mode

Bug: 243334827
Bug: 241501978
Tag: #feature
Test: tested manually
Change-Id: I46b2004d205ecdec470b84d1403cbd99af734626
2 files changed