[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/vx222/vx222.c b/sound/pci/vx222/vx222.c
index 89f58ea..474eac9 100644
--- a/sound/pci/vx222/vx222.c
+++ b/sound/pci/vx222/vx222.c
@@ -73,8 +73,8 @@
 /*
  */
 
-static DECLARE_TLV_DB_SCALE(db_scale_old_vol, -11350, 50, 0);
-static DECLARE_TLV_DB_SCALE(db_scale_akm, -7350, 50, 0);
+static const DECLARE_TLV_DB_SCALE(db_scale_old_vol, -11350, 50, 0);
+static const DECLARE_TLV_DB_SCALE(db_scale_akm, -7350, 50, 0);
 
 static struct snd_vx_hardware vx222_old_hw = {