ASoC: Intel: boards: max98373: get dapm from cpu_dai

There is a prefix on max98373 codec, and the prefix will be added to
the pin name However, there is no prefix on the "Right Spk" and "Left
Spk" widgets.

To avoid getting a redundant prefix, we should get dapm from cpu_dai
component.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210208234043.59750-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_maxim_common.c

@@ -63,17 +63,18 @@ int max98373_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_dai *codec_dai;
+	struct snd_soc_dai *cpu_dai;
 	int j;
 	int ret = 0;
 
 	/* set spk pin by playback only */
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		return 0;
 
+	cpu_dai = asoc_rtd_to_cpu(rtd, 0);
 	for_each_rtd_codec_dais(rtd, j, codec_dai) {
-		struct snd_soc_component *component = codec_dai->component;
 		struct snd_soc_dapm_context *dapm =
-				snd_soc_component_get_dapm(component);
+				snd_soc_component_get_dapm(cpu_dai->component);
 		char pin_name[MAX_98373_PIN_NAME];
 
 		snprintf(pin_name, ARRAY_SIZE(pin_name), "%s Spk",