ALSA: ice1712: Add Philips PSC724 Ultimate Edge

Add psc724 subdriver to snd-ice1712 that provides full support for
Philips PSC724 Ultimate Edge sound cards.

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