ALSA: dice: Split proc interface into a file

This commit adds a file and move some codes related to proc output.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --cc sound/firewire/dice/Makefile
Simple merge

diff --cc sound/firewire/dice/dice-proc.c
Simple merge

diff --cc sound/firewire/dice/dice.c
Simple merge

diff --cc sound/firewire/dice/dice.h
Simple merge