linux-imx

ALSA: fireface: rename protocol layer for former models

In a series of Fireface, later model supports different protocol
from former models.

This commit is a preparation to support both of protocols.

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