Many codecs now clear the pin controls at suspend via snd_hda_shutup_pins()
for reducing the click noise at power-off.  But this leaves some pins
uninitialized, and they'll be never recovered after resume.

This patch adds the proper recovery of cleared pin controls on resume.
Also it adds a check of bus->shutdown so that pins won't be cleared at
module unloading.

Reference: Kernel bug 16339
	http://bugzilla.kernel.org/show_bug.cgi?id=16339

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>