ASoC: fsl_sai: Update slots number according to bclk_ratio

The bclk_ratio is set by .set_bclk_ratio API.
bclk_ratio = slots * slot_width
So if slots is not set by .set_tdm_slot, then it can be calculated
by bclk_ratio.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1659681926-13493-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_sai.c

@@ -530,12 +530,14 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 	u32 watermark;
 	int ret, i;
 
-	if (sai->slots)
-		slots = sai->slots;
-
 	if (sai->slot_width)
 		slot_width = sai->slot_width;
 
+	if (sai->slots)
+		slots = sai->slots;
+	else if (sai->bclk_ratio)
+		slots = sai->bclk_ratio / slot_width;
+
 	pins = DIV_ROUND_UP(channels, slots);
 
 	/*