[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/pontis.h b/sound/pci/ice1712/pontis.h
index d0d1378..1a41825 100644
--- a/sound/pci/ice1712/pontis.h
+++ b/sound/pci/ice1712/pontis.h
@@ -28,6 +28,6 @@
 
 #define VT1720_SUBDEVICE_PONTIS_MS300	0x00020002	/* a dummy id for MS300 */
 
-extern struct snd_ice1712_card_info  snd_vt1720_pontis_cards[];
+extern const struct snd_ice1712_card_info  snd_vt1720_pontis_cards[];
 
 #endif /* __SOUND_PONTIS_H */