[PATCH] Implement basic support for Creative emu1212m and emu1820m.

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http://alsa-project.org/~james/alsa-driver/emu1212m/emu1212m-10.diff

This patch added some basic ALSA support for the Creative emu1212m and
emu1820m

Please review.

What works:
Sound capture and playback to the Audio Dock works.
All sound is captured and played back via the FX bus so works well in jackd.
Currently fixed to 48Khz, S32_LE format, 8 channels.
Requires:
The latest alsa-firmware package to be installed. (One firmware file for
the FPGA on the EMU1010 PCI card, one firmware file for the FPGA on the
Audio Dock.)

TODO:
Implement mixer controls to select different sources for capture.
Implement switching between different rates. Currently done with
#ifdef's in the source code. (Not a trivial task)
Implement support for hot plug of audio dock. (requires a kernel tasklet
polling the device)
Implement some Ardour type interface to load DSP effects and control DSP
routing.

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