ALSA: echoaudio - Re-enable the line-out control for the Mia card

Mia has an undocumented line-out control, and it has to be exposed.

Signed-off-by: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/echoaudio/mia.c b/sound/pci/echoaudio/mia.c
index f3b9b45..f05c8c0 100644
--- a/sound/pci/echoaudio/mia.c
+++ b/sound/pci/echoaudio/mia.c
@@ -29,6 +29,7 @@
 #define ECHOCARD_HAS_ADAT	FALSE
 #define ECHOCARD_HAS_STEREO_BIG_ENDIAN32
 #define ECHOCARD_HAS_MIDI
+#define ECHOCARD_HAS_LINE_OUT_GAIN
 
 /* Pipe indexes */
 #define PX_ANALOG_OUT	0	/* 8 */