ALSA: hda - Fix caching of SPDIF status bits

SPDIF status bits controls are written via snd_hda_codec_write()
without caching.  This causes a regression at resume that the bits
are lost.

Simply replacing it with the cached version fixes the problem.

Reference:
	http://lkml.org/lkml/2008/11/24/324

Signed-off-by: Takashi Iwai <tiwai@suse.de>