Follow-up from "Fix availability groups"

The following discussion from !379 (merged) should be addressed:

• @jason77wang started a discussion: (+8 comments)

  @tanuk @perexg @arun

  There is a bug reported to libgvc: https://gitlab.gnome.org/GNOME/libgnome-volume-control/-/issues/15

  I guess this MR could not fix that problem. Looks like we still need to make availability_group setting perfect.

  So far 2 problems I could think of:

  1. analog-input-internal-mic should not be assigned a availability_group
  2. analog-input-mic, analog-input-dock-mic and ... shouldn't be assigned a availability_group, only analog-input-headphone-mic and analog-input-headset-mic should be assigned a availability_group. (analog-input-mic, analog-input-dock-mic and ..., they all have hardware detection capability, they don't need to share audio jack with headphone).