sound: virtuoso: fix Xonar D1/DX silence after resume

When resuming, we better take the DACs out of the reset state before
trying to use them.

Reference: kernel bug #13599
	http://bugzilla.kernel.org/show_bug.cgi?id=13599



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