ALSA: Remove invalid GENERIC_MIX PCM sublass

SNDRV_PCM_SUBCLASS_GENERIC_MIX is mostly for h/w multi-stream playback
devices, but ca0106 and emu10k1x don't support it (unlike emu10k1).
We shouldn't set that flag to avoid confusion.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ca0106/ca0106_main.c

@@ -1319,7 +1319,6 @@ static int __devinit snd_ca0106_pcm(struct snd_ca0106 *emu, int device)
         }
 
 	pcm->info_flags = 0;
-	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
 	strcpy(pcm->name, "CA0106");
 
 	for(substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 

sound/pci/emu10k1/emu10k1x.c

@@ -858,7 +858,6 @@ static int __devinit snd_emu10k1x_pcm(struct emu10k1x *emu, int device, struct s
 	}
 
 	pcm->info_flags = 0;
-	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
 	switch(device) {
 	case 0:
 		strcpy(pcm->name, "EMU10K1X Front");