ALSA: oxygen: add HiFier Serenade support

Add support for the TempoTec/MediaTek HiFier Serenade sound card.

The PCI ID was already there, but the driver handled it like the
Fantasia model, which resulted in a dummy recording device.  As
a stereo output-only card, this model is to be handled exactly
like the HG2PCI.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index fdd388d..7124340 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1535,6 +1535,7 @@
     * Razer Barracuda AC-1
     * Sondigo Inferno
     * TempoTec HiFier Fantasia
+    * TempoTec HiFier Serenade
 
     This module supports autoprobe and multiple cards.