ASoC: amd: vg: apply sample bits pcm constraint

ACP I2S controller has limitation to program different BCLK
for TX and RX paths.
Headset path uses I2S SP controller instance.
As per requirement, Restricted 32 bits as sample bits by
applying pcm constraint in startup calabck for Headset path.
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20220223071959.13539-5-Vijendar.Mukunda@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/vangogh/acp5x-mach.c

@@ -100,6 +100,13 @@ static const struct snd_pcm_hw_constraint_list constraints_channels = {
 	.mask = 0,
 };
 
+static const unsigned int acp5x_nau8821_format[] = {32};
+
+static struct snd_pcm_hw_constraint_list constraints_sample_bits = {
+	.list = acp5x_nau8821_format,
+	.count = ARRAY_SIZE(acp5x_nau8821_format),
+};
+
 static int acp5x_8821_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
@@ -115,6 +122,9 @@ static int acp5x_8821_startup(struct snd_pcm_substream *substream)
 				   &constraints_channels);
 	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 				   &constraints_rates);
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+				   SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+				   &constraints_sample_bits);
 	return 0;
 }