ALSA: Turtle Beach Multisound Classic/Pinnacle driver

This is driver for Turtle Beach Multisound cards:
Classic, Fiji and Pinnacle.

Tested pcm playback and recording and MIDI playback
on Multisound Pinnacle.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>