We noticed an issue with 4a when pulseaudio is started.
Indeed, pulseaudio tries to call 'get_roles' verb of 'ahl-4a' api when its launched, but, at this moment, 'ahl-4a' is not yet completely initialized and the call ends up with an error.

Pulseaudio need to depend on 'ahl-4a' initialization before calling it.

Note that this issue won't be visible anymore once the correction of JIRA SPEC-1724 will be integrated.