[ALSA] Add even more 'const' to everything related to TLV

Mark TLV 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/mixart/mixart_mixer.c b/sound/pci/mixart/mixart_mixer.c
index 13de0f7..d7d15c0 100644
--- a/sound/pci/mixart/mixart_mixer.c
+++ b/sound/pci/mixart/mixart_mixer.c
@@ -389,7 +389,7 @@
 	return changed;
 }
 
-static DECLARE_TLV_DB_SCALE(db_scale_analog, -9600, 50, 0);
+static const DECLARE_TLV_DB_SCALE(db_scale_analog, -9600, 50, 0);
 
 static struct snd_kcontrol_new mixart_control_analog_level = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
@@ -872,7 +872,7 @@
 	return changed;
 }
 
-static DECLARE_TLV_DB_SCALE(db_scale_digital, -10950, 50, 0);
+static const DECLARE_TLV_DB_SCALE(db_scale_digital, -10950, 50, 0);
 
 static struct snd_kcontrol_new snd_mixart_pcm_vol =
 {