[PATCH] cs46xx, rear and IEC958 PCM channels, moved SCB initialization from from _prepare() -> _hw_params(), etc.

[Benny Sjostrand <gorm@cucumelo.org>]

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Hi!

Once again, updated cs46xx patch.
So, here's a attempt to move stuff from snd_cs46xx_playback_prepare(...),
to snd_cs46xx_hw_params(...), thing works,  but I dont like the aproach,
the main reason is that snd_cs46xx_hw_params(...) is not a good place
for adjusting the sample rate. I've noticed that some OSS applications
the hw_params is called upto 3 times, and I've found a way to find
out when actually the sample rate is set to the value the application
is going to proceed with.


Summary of changes:
- Rear PCM channel
- IEC958 PCM channel
- Turn on Amplifier and setup EGPIO for Santa Cruz card on init
- Fixed voyetra typo  on request  ("voyectra" -> "voyetra")
- Turn ON the HBP bit in SERBCF register, in the cs4630 spec. it
  says that it should be ON to access the FIFO via the backdoors.
- More cleanups in voyetra_setup_eapd_slot(...), same aproach as
   in snd_cs46xx_clear_serial_FIFOs(...), both functions access
    the FIFO's and basically in the same way.
- Some minor cleanups in snd_cs46xx_clear_serial_FIFOs(...)
- Move SCB stuff from snd_cs46xx_playback_prepare(...) to 
snd_cs46xx_playback_hw_params(...)
  course mutexes cant be used in prepare(...)

/Benny

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