ASoC: da7219: Fix a compile warning at CONFIG_COMMON_CLK=n

A trivial fix for the randconfig build error:
  sound/soc/codecs/da7219.c:2366:6: warning: unused variable ‘i’ [-Wunused-variable]

Fixes: d90ba6c ("ASoC: da7219: Expose BCLK and WCLK control through CCF")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/da7219.c

@@ -2357,7 +2357,9 @@ static int da7219_probe(struct snd_soc_component *component)
 static void da7219_remove(struct snd_soc_component *component)
 {
 	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
+#ifdef CONFIG_COMMON_CLK
 	int i;
+#endif
 
 	da7219_aad_exit(component);