VolumeDialog: Hide the music row if there is an ally stream

- Introduce the concept of tracking ally streams, useful
  when you are still on a call, for instance, but you also
  want to change the media volume for a future use. When
  you tap on the media row the calling row will disappear
  because of AOSP logic. With this patch, we hide the music
  row if there is a "special" row, like the voice call volume
  row, and show it on the expanded panel like our other custom
  rows. After collapsing the expanded panel we set active
  stream back to this "special" row.

Change-Id: I23792369cf1fd8e0b4d6913c67d02bd4c09f1ac7
Co-authored-by: Arian <arian.kulmer@web.de>
Signed-off-by: Jesse Chan <jc@lineageos.org>