ASoC: fsl_sai: support more than 2 channels

The FSL SAI can support up to 32 channels using TDM. Report that value so
they can actually be used.

Tested using 8 channels.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_sai.c

@@ -668,7 +668,7 @@ static struct snd_soc_dai_driver fsl_sai_dai = {
 	.playback = {
 		.stream_name = "CPU-Playback",
 		.channels_min = 1,
-		.channels_max = 2,
+		.channels_max = 32,
 		.rate_min = 8000,
 		.rate_max = 192000,
 		.rates = SNDRV_PCM_RATE_KNOT,
@@ -677,7 +677,7 @@ static struct snd_soc_dai_driver fsl_sai_dai = {
 	.capture = {
 		.stream_name = "CPU-Capture",
 		.channels_min = 1,
-		.channels_max = 2,
+		.channels_max = 32,
 		.rate_min = 8000,
 		.rate_max = 192000,
 		.rates = SNDRV_PCM_RATE_KNOT,