module-role-cork: corking groups
The ducking groups of module-role-ducking are ported, with the same syntax.
Overlapping layers of corking rules can be applied. For example, the following parameters:
"trigger_roles=system/notification cork_roles=notification,media/media"
will make "notification" cork "media", with "system" corking these two roles.
Signed-off-by: Antoine Girard-Vallee antoine.girard-vallee@humanware.com