[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/amp.h b/sound/pci/ice1712/amp.h
index a0fc89b..7b667ba 100644
--- a/sound/pci/ice1712/amp.h
+++ b/sound/pci/ice1712/amp.h
@@ -42,7 +42,7 @@
 #define WM_DAC_CTRL	0x02
 #define WM_INT_CTRL	0x03
 
-extern struct snd_ice1712_card_info  snd_vt1724_amp_cards[];
+extern const struct snd_ice1712_card_info  snd_vt1724_amp_cards[];
 
 
 #endif /* __SOUND_AMP_H */