ASoC: rl6231: Modify the target DMIC clock rate

Some DMIC components will not work correctly in the clock rate 3.072MHz.
We recommend the clock rate 1.536MHz in the gerenal case.
Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Link: https://lore.kernel.org/r/20200604071016.3981-1-oder_chiou@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rl6231.c

@@ -80,8 +80,8 @@ int rl6231_calc_dmic_clk(int rate)
 	for (i = 0; i < ARRAY_SIZE(div); i++) {
 		if ((div[i] % 3) == 0)
 			continue;
-		/* find divider that gives DMIC frequency below 3.072MHz */
-		if (3072000 * div[i] >= rate)
+		/* find divider that gives DMIC frequency below 1.536MHz */
+		if (1536000 * div[i] >= rate)
 			return i;
 	}