ASoC: rt1015: set snd_soc_dai_ops in rt1015_dai driver

snd_soc_dai_driver should set ops in rt1015_dai driver.
Also make the two variable static to fix sparse warnings.

Fixes: df310074 ("ASoC: rt1015: add rt1015 amplifier driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20200302070522.48104-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt1015.c

@@ -857,6 +857,7 @@ static struct snd_soc_dai_driver rt1015_dai[] = {
 			.rates = RT1015_STEREO_RATES,
 			.formats = RT1015_FORMATS,
 		},
+		.ops    = &rt1015_aif_dai_ops,
 	}
 };