Make audio(9) get_props() optional, remove it from duplex drivers

The property bits of audio(9) are obsolete and ought to be removed
completely.

sys/dev/audio.c:audio_open() currently uses get_prop

Make audio(9) get_props() optional, remove it from duplex drivers

The property bits of audio(9) are obsolete and ought to be removed
completely.

sys/dev/audio.c:audio_open() currently uses get_props() to bail out if
read *and* write was requested on a non-duplex driver.

Drivers that currently support playing but not recording need adjustment
before the API can be cleaned up.

Drivers that advertise themselves as full duplex, i.e. those that always
return AUDIO_PROP_FULLDUPLEX unconditionally in their get_props() currently
always succeed this check.

As this is the only property, losen audio_open()'s DIAGNOSTIC check and only
do the duplex check if the driver provides get_props().

This allows for simple removal of get_props() from full-duplex drivers
without adding any other code or without changing functionality.

This includes all audio drivers under sys/dev/pci/ (maestro(4) being the
only unfinished exception here).

Other drivers as well as the API change can then follow in smaller diffs.

This builds on amd64, arm64, i386, macppc and sparc64.
amd64 with azalia(4) still plays, records as well as plays and records
at the same time on my X230 as tested with

$ aucat -i play.wav [-o rec.wav]

alpha and hppa tests by miod
OK ratchov miod

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Remove drain(), query_encoding(), mappage() and get_default_params()
methods from all audio drivers and from the audio_if structure as they
are never called.

Make use of macobio_* methods to manage the i2s GPIOs, remove the customs
gpio_* methods and move the remaining global variables in the softc.

ok ratchov@, krw@

add support for muting the master channel on i2s based cards, this allows the
"mute" key on keyboards to function too.
tested by kettenis on aoa(4) and snapper(4) by me.

from Martin Pieuchot
ok kett

add support for muting the master channel on i2s based cards, this allows the
"mute" key on keyboards to function too.
tested by kettenis on aoa(4) and snapper(4) by me.

from Martin Pieuchot
ok kettenis@ ratchov@

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- remove double cvs id's

native default parameters for i2s devices instead of 8kHz
mulaw mono, which few can even do.

"Please just get this in." brad@

o implement proper volume control table based on chipset docs
o attempt to make record work (but silence for now)
from drahn@, ok maja@, drahn@

oops

- add needed bass & treble glue in i2s;
- add support for bass & treble in snapper;

ok drahn@

add an i2s framework, which can be reused in new audio drivers
for macppc, as most modern Apple machines have i2s-based audio.

also let snapper use i2s.c right away;

tested by Antoine Jacoutot, dra

add an i2s framework, which can be reused in new audio drivers
for macppc, as most modern Apple machines have i2s-based audio.

also let snapper use i2s.c right away;

tested by Antoine Jacoutot, drahn@ and kettenis@
"yes, commit!" drahn@, ok kettenis@

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