hearing_aid: Reset the resampler context when all devices are disconnected

Previously was only reset when the audio stream was suspended.
This lead to HCI Read Clock commands continously being sent event
after the devices are disconnected.

Bug: 348309588
Bug: 321057945
Test: m com.android.btservices
Test: Manual |
  Connect HA devices |
  Start stream |
  Disconnect devices from the settings |
  Validate that HCI Read Clock commands are no longer being sent
Flag: com.android.bluetooth.flags.asha_asrc
Change-Id: Icf44a86363a1c2806816c7785cbf9c77192cbc39