Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Implement suspend/resume operation for snd_csa(4)

PR: kern/82243
Submitted by: Serge Semenenko
Approved by: re (scottl)
MFC after: 1 month

the turtle beach santacruz implements ac97 eapd in an inverted sense -
inform the ac97 code of this.

update this driver to use new firmware and incorporate many fixes.

this works on cs4630 chips, and should implement the clkrun hack for
thinkpads- this will display diagnostic messages when triggered until its
correctness is established.

- Handle an interrupt for csa primarily in the bridge driver,
then invoke the children. As the value of HISR can be read
only once, pass the HISR to the children via struct
csa_bridgeinfo, stored in the ivars of them.
- Clear the contents of serial FIFO upon stopping the DMA for
playing. This may eliminate buzz on playing. Experimental.

- Introduce the bridge drivers for Sound Blaser, GUS and Crystal
Semiconductor CS461x/428x.
- Add support for GUS and CS461x/428x pcm.

Bridges reviewed by: dfr, cg
GUS non-PnP support submitted by: Ville-Pertti Keinonen <will@iki.fi>
GUS PnP support tested by: Michiru Saito <mich@mtci.ne.jp>