[ALSA] Add 'const' to files in pci/ice1712/

Mark a lot of data as 'const'
Signed-of-by: Philipp Matthias Hahn <pmhahn@pmhahn.de>

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/ice1712/vt1720_mobo.h b/sound/pci/ice1712/vt1720_mobo.h
index 0b1b0ee..70af3ad 100644
--- a/sound/pci/ice1712/vt1720_mobo.h
+++ b/sound/pci/ice1712/vt1720_mobo.h
@@ -36,6 +36,6 @@
 #define VT1720_SUBDEVICE_9CJS		0x0f272327
 #define VT1720_SUBDEVICE_SN25P		0x97123650
 
-extern struct snd_ice1712_card_info  snd_vt1720_mobo_cards[];
+extern const struct snd_ice1712_card_info  snd_vt1720_mobo_cards[];
 
 #endif /* __SOUND_VT1720_MOBO_H */