ASoC: amd: acp-da7219-max98357: Make symbol da7219_dai_clk static

Fixes the following sparse warning:

sound/soc/amd/acp-da7219-max98357a.c:46:12: warning:
 symbol 'da7219_dai_clk' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/acp-da7219-max98357a.c

@@ -43,7 +43,7 @@
 #define DUAL_CHANNEL		2
 
 static struct snd_soc_jack cz_jack;
-struct clk *da7219_dai_clk;
+static struct clk *da7219_dai_clk;
 
 static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
 {