ALSA: oxygen: merge HiFier driver into snd-oxygen

The snd-hifier driver contains more duplicated code than model-specific
code, so it does not make sense for it to be a separate driver.
Handling the two-channel output restriction can be easily done in the
generic driver.

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 d0eb696..f1a1787 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -974,13 +974,6 @@
 
     See hdspm.txt for details.
 
-  Module snd-hifier
-  -----------------
-
-    Module for the MediaTek/TempoTec HiFier Fantasia sound card.
-
-    This module supports autoprobe and multiple cards.
-
   Module snd-ice1712
   ------------------
 
@@ -1531,7 +1524,7 @@
   Module snd-oxygen
   -----------------
 
-    Module for sound cards based on the C-Media CMI8788 chip:
+    Module for sound cards based on the C-Media CMI8787/8788 chip:
     * Asound A-8788
     * AuzenTech X-Meridian
     * Bgears b-Enspirer
@@ -1540,6 +1533,7 @@
     * HT-Omega Claro halo (XT)
     * Razer Barracuda AC-1
     * Sondigo Inferno
+    * TempoTec HiFier Fantasia
 
     This module supports autoprobe and multiple cards.