ALSA: ice1724: enable suspend on unknown ICE1724 cards

Assume that unknown ICE1724-based cards are AC97-only that can suspend
without any additional card-specific code.

This fixes suspend on Gainward Hollywood@Home 7.1.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>