The 'black_hole' component provides dummy implementations of common
session interfaces.

At this time, the following sessions are provided if enabled
in the configuration of the component.

* Audio_in
* Audio_out
* Capture
* Event
* Nic
* Uplink
* ROM
* Gpu
* Usb
* Play
* Record

<config>
	<audio_in/>
	<audio_out/>
	<capture/>
	<event/>
	<nic/>
	<uplink/>
	<rom/>
	<gpu/>
	<usb/>
	<play/>
	<record/>
</config>

Black hole optionally requests the following sessions as client.

* Uplink client

<config>
	<uplink_client/>
</config>
