ASoC: clock gating is decided by bool on snd_soc_of_parse_daifmt()

ASoC clock gate settings are continuous/gated only.
This patch decides it as bool, then, gated clock will be default.
Special thanks to Stephen

Cc: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-core.c

@@ -4229,9 +4229,6 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
 		{ "pdm",	SND_SOC_DAIFMT_PDM},
 		{ "msb",	SND_SOC_DAIFMT_MSB },
 		{ "lsb",	SND_SOC_DAIFMT_LSB },
-	}, of_clock_table[] = {
-		{ "continuous",	SND_SOC_DAIFMT_CONT },
-		{ "gated",	SND_SOC_DAIFMT_GATED },
 	};
 
 	if (!prefix)
@@ -4253,19 +4250,14 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
 	}
 
 	/*
-	 * check "[prefix]clock-gating = xxx"
+	 * check "[prefix]continuous-clock"
 	 * SND_SOC_DAIFMT_CLOCK_MASK area
 	 */
-	snprintf(prop, sizeof(prop), "%sclock-gating", prefix);
-	ret = of_property_read_string(np, prop, &str);
-	if (ret == 0) {
-		for (i = 0; i < ARRAY_SIZE(of_clock_table); i++) {
-			if (strcmp(str, of_clock_table[i].name) == 0) {
-				format |= of_clock_table[i].val;
-				break;
-			}
-		}
-	}
+	snprintf(prop, sizeof(prop), "%scontinuous-clock", prefix);
+	if (of_get_property(np, prop, NULL))
+		format |= SND_SOC_DAIFMT_CONT;
+	else
+		format |= SND_SOC_DAIFMT_GATED;
 
 	/*
 	 * check "[prefix]bitclock-inversion"