sndiod: Propagate the controls' display string to clients.

with help from edd@ and armani@

sndio: Add a display string to the sioctl_open API

For hardware devices, add a server.device control
with a single item and the device name as display
string.

Add the necessary sndioctl(1) bits to

sndio: Add a display string to the sioctl_open API

For hardware devices, add a server.device control
with a single item and the device name as display
string.

Add the necessary sndioctl(1) bits to print it.

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Add API to control audio device parameters exposed by sndiod.

The API exposes controls of modern audio hardware and sndiod software
volume knobs in a uniform way. Hardware knobs are exposed through

Add API to control audio device parameters exposed by sndiod.

The API exposes controls of modern audio hardware and sndiod software
volume knobs in a uniform way. Hardware knobs are exposed through
sndiod. Multiple programs may use the controls at the same time
without the need to continuously scan the controls.

For now sndiod exposes only its own controls and the master output and
input volumes of the underlying hardware (if any), i.e. those
typically exposed by acpi volume keys.

ok deraadt

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