[card] Implement VSID setting when changing to voicecall.
[card] Implement VSID setting when changing to voicecall.

Some adaptations have a notion of VSIDs. To enable audio route during
voice call in addition to setting the audio mode we need to enable one
(or more) VSIDs. This first implementation only supports enabling one
VSID at a time.

jusa/pulseaudio-modules-droid,jusa/pulseaudio-modules-droid,mer-hybris/pulseaudio-modules-droid,mer-hybris/pulseaudio-modules-droid,ballock/pulseaudio-modules-droid,mlehtima/pulseaudio-modules-droid,ballock/pulseaudio-modules-droid,mlehtima/pulseaudio-modules-droid