[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/phase.h b/sound/pci/ice1712/phase.h
index 13e841b..ad379a9 100644
--- a/sound/pci/ice1712/phase.h
+++ b/sound/pci/ice1712/phase.h
@@ -31,7 +31,7 @@
 #define VT1724_SUBDEVICE_PHASE28	0x3b154911
 
 /* entry point */
-extern struct snd_ice1712_card_info snd_vt1724_phase_cards[];
+extern const struct snd_ice1712_card_info snd_vt1724_phase_cards[];
 
 /* PHASE28 GPIO bits */
 #define PHASE28_SPI_MISO	(1 << 21)