BluetoothHearingAid: Change all logs guarded by VDBG to Log.v

This will allow to use Log.isLoggable to configure VDBG as
isLoggable requires a level, so we need the logs guarded by VDBG
to have a different level than the one guarded by DBG.

Bug: 311713922
Test: m com.android.btservices
Change-Id: Iabea2fca99633c6faf7c3a2eca81090cb1940ada