ASoC: Mediatek: MT8183: Fix build error in mt8183_da7219_max98357_dev_probe

When building CONFIG_SND_SOC_MT8183_DA7219_MAX98357A=m
gcc warn this:

sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c: In function mt8183_da7219_max98357_dev_probe:
sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c:413:13: error: struct snd_soc_dai_link has no member named platform; did you mean platforms?
   dai_link->platform = NULL;
             ^~~~~~~~
             platforms

use 'dai_link->platforms' instead of 'dai_link->platform'.

Fixes: 11c02690 ("ASoC: Mediatek: MT8183: Add machine driver with TS3A227")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>