ALSA: hda - remove unused clear of STATESTS

Although the code was updated last year the "#if 0" surrounding it
dates back to the original git commit.  The function will be moved to
a new file, no need to carry the dead code.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>